Example usage for android.graphics Paint setShadowLayer

List of usage examples for android.graphics Paint setShadowLayer

Introduction

In this page you can find the example usage for android.graphics Paint setShadowLayer.

Prototype

public void setShadowLayer(float radius, float dx, float dy, int shadowColor) 

Source Link

Document

This draws a shadow layer below the main layer, with the specified offset and color, and blur radius.

Usage

From source file:com.anysoftkeyboard.keyboards.views.AnyKeyboardBaseView.java

private void onBufferDraw(Canvas canvas) {
    if (mKeyboardChanged) {
        invalidateAllKeys();// w w w. j a  v  a  2  s  .  c  om
        mKeyboardChanged = false;
    }

    canvas.getClipBounds(mDirtyRect);

    if (mKeyboard == null)
        return;

    final boolean drawKeyboardNameText = (mKeyboardNameTextSize > 1f)
            && AnyApplication.getConfig().getShowKeyboardNameText();

    final boolean drawHintText = (mHintTextSize > 1) && AnyApplication.getConfig().getShowHintTextOnKeys();
    // TODO: calls to AnyApplication.getConfig().getXXXXX() functions are
    // not yet implemented,
    // but need to when allowing preferences to override theme settings of
    // these values
    // right now just using what should be the default values for these
    // unimplemented preferences

    final boolean useCustomKeyTextColor = false;
    // TODO: final boolean useCustomKeyTextColor =
    // AnyApplication.getConfig().getUseCustomTextColorOnKeys();
    final ColorStateList keyTextColor = useCustomKeyTextColor
            ? new ColorStateList(new int[][] { { 0 } }, new int[] { 0xFF6666FF })
            : mKeyTextColor;
    // TODO: ? AnyApplication.getConfig().getCustomKeyTextColorOnKeys() :
    // mKeyTextColor;

    final boolean useCustomHintColor = drawHintText && false;
    // TODO: final boolean useCustomHintColor = drawHintText &&
    // AnyApplication.getConfig().getUseCustomHintColorOnKeys();
    final ColorStateList hintColor = useCustomHintColor
            ? new ColorStateList(new int[][] { { 0 } }, new int[] { 0xFFFF6666 })
            : mHintTextColor;
    // TODO: ? AnyApplication.getConfig().getCustomHintColorOnKeys() :
    // mHintTextColor;

    // allow preferences to override theme settings for hint text position
    final boolean useCustomHintAlign = drawHintText && AnyApplication.getConfig().getUseCustomHintAlign();
    final int hintAlign = useCustomHintAlign ? AnyApplication.getConfig().getCustomHintAlign()
            : mHintLabelAlign;
    final int hintVAlign = useCustomHintAlign ? AnyApplication.getConfig().getCustomHintVAlign()
            : mHintLabelVAlign;

    final Paint paint = mPaint;
    final Drawable keyBackground = mKeyBackground;
    final Rect clipRegion = mClipRegion;
    final int kbdPaddingLeft = getPaddingLeft();
    final int kbdPaddingTop = getPaddingTop();
    final Key[] keys = mKeys;
    final Key invalidKey = mInvalidatedKey;

    boolean drawSingleKey = false;
    if (invalidKey != null && canvas.getClipBounds(clipRegion)) {
        // TODO we should use Rect.inset and Rect.contains here.
        // Is clipRegion completely contained within the invalidated key?
        if (invalidKey.x + kbdPaddingLeft - 1 <= clipRegion.left
                && invalidKey.y + kbdPaddingTop - 1 <= clipRegion.top
                && invalidKey.x + invalidKey.width + kbdPaddingLeft + 1 >= clipRegion.right
                && invalidKey.y + invalidKey.height + kbdPaddingTop + 1 >= clipRegion.bottom) {
            drawSingleKey = true;
        }
    }
    final int keyCount = keys.length;
    for (int i = 0; i < keyCount; i++) {
        final AnyKey key = (AnyKey) keys[i];
        final boolean keyIsSpace = isSpaceKey(key);

        if (drawSingleKey && (invalidKey != key)) {
            continue;
        }
        if (!mDirtyRect.intersects(key.x + kbdPaddingLeft, key.y + kbdPaddingTop,
                key.x + key.width + kbdPaddingLeft, key.y + key.height + kbdPaddingTop)) {
            continue;
        }
        int[] drawableState = key.getCurrentDrawableState(mDrawableStatesProvider);

        if (keyIsSpace)
            paint.setColor(mKeyboardNameTextColor.getColorForState(drawableState, 0xFF000000));
        else
            paint.setColor(keyTextColor.getColorForState(drawableState, 0xFF000000));
        keyBackground.setState(drawableState);

        // Switch the character to uppercase if shift is pressed
        CharSequence label = key.label == null ? null : adjustCase(key).toString();

        final Rect bounds = keyBackground.getBounds();
        if ((key.width != bounds.right) || (key.height != bounds.bottom)) {
            keyBackground.setBounds(0, 0, key.width, key.height);
        }
        canvas.translate(key.x + kbdPaddingLeft, key.y + kbdPaddingTop);
        keyBackground.draw(canvas);

        if (TextUtils.isEmpty(label)) {
            Drawable iconToDraw = getIconToDrawForKey(key, false);
            if (iconToDraw != null/* && shouldDrawIcon */) {
                //http://developer.android.com/reference/android/graphics/drawable/Drawable.html#getCurrent()
                //http://stackoverflow.com/a/103600/1324235
                final boolean is9Patch = iconToDraw.getCurrent() instanceof NinePatchDrawable;

                // Special handing for the upper-right number hint icons
                final int drawableWidth;
                final int drawableHeight;
                final int drawableX;
                final int drawableY;

                drawableWidth = is9Patch ? key.width : iconToDraw.getIntrinsicWidth();
                drawableHeight = is9Patch ? key.height : iconToDraw.getIntrinsicHeight();
                drawableX = (key.width + mKeyBackgroundPadding.left - mKeyBackgroundPadding.right
                        - drawableWidth) / 2;
                drawableY = (key.height + mKeyBackgroundPadding.top - mKeyBackgroundPadding.bottom
                        - drawableHeight) / 2;

                canvas.translate(drawableX, drawableY);
                iconToDraw.setBounds(0, 0, drawableWidth, drawableHeight);
                iconToDraw.draw(canvas);
                canvas.translate(-drawableX, -drawableY);
                if (keyIsSpace && drawKeyboardNameText) {
                    // now a little hack, I'll set the label now, so it get
                    // drawn.
                    label = mKeyboardName;
                }
            } else {
                // ho... no icon.
                // I'll try to guess the text
                label = guessLabelForKey(key.codes[0]);
                if (TextUtils.isEmpty(label)) {
                    Log.w(TAG, "That's unfortunate, for key " + key.codes[0] + " at (" + key.x + ", " + key.y
                            + ") there is no icon nor label. Action ID is " + mKeyboardActionType);
                }
            }
        }

        if (label != null) {
            // For characters, use large font. For labels like "Done", use
            // small font.
            final FontMetrics fm;
            if (keyIsSpace) {
                paint.setTextSize(mKeyboardNameTextSize);
                paint.setTypeface(Typeface.DEFAULT_BOLD);
                if (mKeyboardNameFM == null)
                    mKeyboardNameFM = paint.getFontMetrics();
                fm = mKeyboardNameFM;
            } else if (label.length() > 1 && key.codes.length < 2) {
                paint.setTextSize(mLabelTextSize);
                paint.setTypeface(Typeface.DEFAULT_BOLD);
                if (mLabelFM == null)
                    mLabelFM = paint.getFontMetrics();
                fm = mLabelFM;
            } else {
                fm = setPaintToKeyText(paint);
            }

            final float labelHeight = -fm.top;
            // Draw a drop shadow for the text
            paint.setShadowLayer(mShadowRadius, mShadowOffsetX, mShadowOffsetY, mShadowColor);

            // (+)This is the trick to get RTL/LTR text correct
            // no matter what: StaticLayout
            // this should be in the top left corner of the key
            float textWidth = paint.measureText(label, 0, label.length());
            // I'm going to try something if the key is too small for the
            // text:
            // 1) divide the text size by 1.5
            // 2) if still too large, divide by 2.5
            // 3) show no text
            if (textWidth > key.width) {
                Log.d(TAG, "Label '" + label + "' is too large for the key. Reducing by 1.5.");
                paint.setTextSize(mKeyTextSize / 1.5f);
                textWidth = paint.measureText(label, 0, label.length());
                if (textWidth > key.width) {
                    Log.d(TAG, "Label '" + label + "' is too large for the key. Reducing by 2.5.");
                    paint.setTextSize(mKeyTextSize / 2.5f);
                    textWidth = paint.measureText(label, 0, label.length());
                    if (textWidth > key.width) {
                        Log.d(TAG, "Label '" + label + "' is too large for the key. Showing no text.");
                        paint.setTextSize(0f);
                        textWidth = paint.measureText(label, 0, label.length());
                    }
                }
            }

            // the center of the drawable space, which is value used
            // previously for vertically
            // positioning the key label
            final float centerY = mKeyBackgroundPadding.top
                    + ((key.height - mKeyBackgroundPadding.top - mKeyBackgroundPadding.bottom)
                            / (keyIsSpace ? 3 : 2));// the label on the space is a bit higher

            // the X coordinate for the center of the main label text is
            // unaffected by the hints
            final float centerX = mKeyBackgroundPadding.left
                    + (key.width - mKeyBackgroundPadding.left - mKeyBackgroundPadding.right) / 2;

            final float textX = centerX;
            final float textY;
            // Some devices (mostly pre-Honeycomb, have issues with RTL text
            // drawing.
            // Of course, there is no issue with a single character :)
            // so, we'll use the RTL secured drawing (via StaticLayout) for
            // labels.
            if (label.length() > 1 && !AnyApplication.getConfig().workaround_alwaysUseDrawText()) {
                // calculate Y coordinate of top of text based on center
                // location
                textY = centerY - ((labelHeight - paint.descent()) / 2);
                canvas.translate(textX, textY);
                Log.d(TAG, "Using RTL fix for key draw '" + label + "'");
                // RTL fix. But it costs, let do it when in need (more than
                // 1 character)
                StaticLayout labelText = new StaticLayout(label, new TextPaint(paint), (int) textWidth,
                        Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
                labelText.draw(canvas);
            } else {
                // to get Y coordinate of baseline from center of text,
                // first add half the height (to get to
                // bottom of text), then subtract the part below the
                // baseline. Note that fm.top is negative.
                textY = centerY + ((labelHeight - paint.descent()) / 2);
                canvas.translate(textX, textY);
                canvas.drawText(label, 0, label.length(), 0, 0, paint);
            }
            canvas.translate(-textX, -textY);
            // (-)

            // Turn off drop shadow
            paint.setShadowLayer(0, 0, 0, 0);
        }

        if (drawHintText) {
            if ((key.popupCharacters != null && key.popupCharacters.length() > 0) || (key.popupResId != 0)
                    || (key.longPressCode != 0)) {
                Paint.Align oldAlign = paint.getTextAlign();

                String hintText = null;

                if (key.hintLabel != null && key.hintLabel.length() > 0) {
                    hintText = key.hintLabel.toString();
                    // it is the responsibility of the keyboard layout
                    // designer to ensure that they do
                    // not put too many characters in the hint label...
                } else if (key.longPressCode != 0) {
                    if (Character.isLetterOrDigit(key.longPressCode))
                        hintText = Character.toString((char) key.longPressCode);
                } else if (key.popupCharacters != null) {
                    final String hintString = key.popupCharacters.toString();
                    final int hintLength = hintString.length();
                    if (hintLength <= 3)
                        hintText = hintString;
                }

                // if hintText is still null, it means it didn't fit one of
                // the above
                // cases, so we should provide the hint using the default
                if (hintText == null) {
                    if (mHintOverflowLabel != null)
                        hintText = mHintOverflowLabel.toString();
                    else {
                        // theme does not provide a defaultHintLabel
                        // use  if hints are above, ... if hints are
                        // below
                        // (to avoid being too close to main label/icon)
                        if (hintVAlign == Gravity.TOP)
                            hintText = "";
                        else
                            hintText = "...";
                    }
                }

                if (mKeyboard.isShifted())
                    hintText = hintText.toUpperCase();

                // now draw hint
                paint.setTypeface(Typeface.DEFAULT);
                paint.setColor(hintColor.getColorForState(drawableState, 0xFF000000));
                paint.setTextSize(mHintTextSize);
                // get the hint text font metrics so that we know the size
                // of the hint when
                // we try to position the main label (to try to make sure
                // they don't overlap)
                if (mHintTextFM == null) {
                    mHintTextFM = paint.getFontMetrics();
                }

                final float hintX;
                final float hintY;

                // the (float) 0.5 value is added or subtracted to just give
                // a little more room
                // in case the theme designer didn't account for the hint
                // label location
                if (hintAlign == Gravity.LEFT) {
                    // left
                    paint.setTextAlign(Paint.Align.LEFT);
                    hintX = mKeyBackgroundPadding.left + (float) 0.5;
                } else if (hintAlign == Gravity.CENTER) {
                    // center
                    paint.setTextAlign(Paint.Align.CENTER);
                    hintX = mKeyBackgroundPadding.left
                            + (key.width - mKeyBackgroundPadding.left - mKeyBackgroundPadding.right) / 2;
                } else {
                    // right
                    paint.setTextAlign(Paint.Align.RIGHT);
                    hintX = key.width - mKeyBackgroundPadding.right - (float) 0.5;
                }

                if (hintVAlign == Gravity.TOP) {
                    // above
                    hintY = mKeyBackgroundPadding.top - mHintTextFM.top + (float) 0.5;
                } else {
                    // below
                    hintY = key.height - mKeyBackgroundPadding.bottom - mHintTextFM.bottom - (float) 0.5;
                }

                canvas.drawText(hintText, hintX, hintY, paint);
                paint.setTextAlign(oldAlign);
            }
        }

        canvas.translate(-key.x - kbdPaddingLeft, -key.y - kbdPaddingTop);
    }
    mInvalidatedKey = null;
    // Overlay a dark rectangle to dim the keyboard
    if (mMiniKeyboard != null && mMiniKeyboardVisible) {
        paint.setColor((int) (mBackgroundDimAmount * 0xFF) << 24);
        canvas.drawRect(0, 0, getWidth(), getHeight(), paint);
    }

    if (FeaturesSet.DEBUG_LOG) {
        if (mShowTouchPoints) {
            for (PointerTracker tracker : mPointerTrackers) {
                int startX = tracker.getStartX();
                int startY = tracker.getStartY();
                int lastX = tracker.getLastX();
                int lastY = tracker.getLastY();
                paint.setAlpha(128);
                paint.setColor(0xFFFF0000);
                canvas.drawCircle(startX, startY, 3, paint);
                canvas.drawLine(startX, startY, lastX, lastY, paint);
                paint.setColor(0xFF0000FF);
                canvas.drawCircle(lastX, lastY, 3, paint);
                paint.setColor(0xFF00FF00);
                canvas.drawCircle((startX + lastX) / 2, (startY + lastY) / 2, 2, paint);
            }
        }
    }

    mDrawPending = false;
    mDirtyRect.setEmpty();
}

From source file:com.yek.keyboard.keyboards.views.AnyKeyboardViewBase.java

@CallSuper
protected void onBufferDraw(Canvas canvas, final Paint paint) {
    if (mKeyboardChanged) {
        invalidateAllKeys();/* w  w  w  .j a va2s  .c om*/
        mKeyboardChanged = false;
    }

    canvas.getClipBounds(mDirtyRect);

    if (mKeyboard == null)
        return;

    final boolean drawKeyboardNameText = (mKeyboardNameTextSize > 1f)
            && AnyApplication.getConfig().getShowKeyboardNameText();

    final boolean drawHintText = (mHintTextSize > 1) && AnyApplication.getConfig().getShowHintTextOnKeys();

    final boolean useCustomKeyTextColor = false;
    // TODO: final boolean useCustomKeyTextColor =
    // AnyApplication.getConfig().getUseCustomTextColorOnKeys();
    final ColorStateList keyTextColor = useCustomKeyTextColor
            ? new ColorStateList(new int[][] { { 0 } }, new int[] { 0xFF6666FF })
            : mKeyTextColor;

    final boolean useCustomHintColor = drawHintText && false;
    // TODO: final boolean useCustomHintColor = drawHintText &&
    final ColorStateList hintColor = useCustomHintColor
            ? new ColorStateList(new int[][] { { 0 } }, new int[] { 0xFFFF6666 })
            : mHintTextColor;

    // allow preferences to override theme settings for hint text position
    final boolean useCustomHintAlign = drawHintText && AnyApplication.getConfig().getUseCustomHintAlign();
    final int hintAlign = useCustomHintAlign ? AnyApplication.getConfig().getCustomHintAlign()
            : mHintLabelAlign;
    final int hintVAlign = useCustomHintAlign ? AnyApplication.getConfig().getCustomHintVAlign()
            : mHintLabelVAlign;

    final Drawable keyBackground = mKeyBackground;
    final Rect clipRegion = mClipRegion;
    final int kbdPaddingLeft = getPaddingLeft();
    final int kbdPaddingTop = getPaddingTop();
    final Keyboard.Key[] keys = mKeys;
    final Keyboard.Key invalidKey = mInvalidatedKey;

    boolean drawSingleKey = false;
    if (invalidKey != null && canvas.getClipBounds(clipRegion)) {
        // TODO we should use Rect.inset and Rect.contains here.
        // Is clipRegion completely contained within the invalidated key?
        if (invalidKey.x + kbdPaddingLeft - 1 <= clipRegion.left
                && invalidKey.y + kbdPaddingTop - 1 <= clipRegion.top
                && invalidKey.x + invalidKey.width + kbdPaddingLeft + 1 >= clipRegion.right
                && invalidKey.y + invalidKey.height + kbdPaddingTop + 1 >= clipRegion.bottom) {
            drawSingleKey = true;
        }
    }

    for (Keyboard.Key keyBase : keys) {
        final AnyKeyboard.AnyKey key = (AnyKeyboard.AnyKey) keyBase;
        final boolean keyIsSpace = isSpaceKey(key);

        if (drawSingleKey && (invalidKey != key)) {
            continue;
        }
        if (!mDirtyRect.intersects(key.x + kbdPaddingLeft, key.y + kbdPaddingTop,
                key.x + key.width + kbdPaddingLeft, key.y + key.height + kbdPaddingTop)) {
            continue;
        }
        int[] drawableState = key.getCurrentDrawableState(mDrawableStatesProvider);

        if (keyIsSpace)
            paint.setColor(mKeyboardNameTextColor);
        else
            paint.setColor(keyTextColor.getColorForState(drawableState, 0xFF000000));
        keyBackground.setState(drawableState);

        // Switch the character to uppercase if shift is pressed
        CharSequence label = key.label == null ? null : adjustLabelToShiftState(key);

        final Rect bounds = keyBackground.getBounds();
        if ((key.width != bounds.right) || (key.height != bounds.bottom)) {
            keyBackground.setBounds(0, 0, key.width, key.height);
        }
        canvas.translate(key.x + kbdPaddingLeft, key.y + kbdPaddingTop);
        keyBackground.draw(canvas);

        if (TextUtils.isEmpty(label)) {
            Drawable iconToDraw = getIconToDrawForKey(key, false);
            if (iconToDraw != null/* && shouldDrawIcon */) {
                //http://developer.android.com/reference/android/graphics/drawable/Drawable.html#getCurrent()
                //http://stackoverflow.com/a/103600/1324235
                final boolean is9Patch = iconToDraw.getCurrent() instanceof NinePatchDrawable;

                // Special handing for the upper-right number hint icons
                final int drawableWidth;
                final int drawableHeight;
                final int drawableX;
                final int drawableY;

                drawableWidth = is9Patch ? key.width : iconToDraw.getIntrinsicWidth();
                drawableHeight = is9Patch ? key.height : iconToDraw.getIntrinsicHeight();
                drawableX = (key.width + mKeyBackgroundPadding.left - mKeyBackgroundPadding.right
                        - drawableWidth) / 2;
                drawableY = (key.height + mKeyBackgroundPadding.top - mKeyBackgroundPadding.bottom
                        - drawableHeight) / 2;

                canvas.translate(drawableX, drawableY);
                iconToDraw.setBounds(0, 0, drawableWidth, drawableHeight);
                iconToDraw.draw(canvas);
                canvas.translate(-drawableX, -drawableY);
                if (keyIsSpace && drawKeyboardNameText) {
                    // now a little hack, I'll set the label now, so it get
                    // drawn.
                    label = mKeyboardName;
                }
            } else {
                // ho... no icon.
                // I'll try to guess the text
                label = guessLabelForKey(key.getPrimaryCode());
            }
        }

        if (label != null) {
            // For characters, use large font. For labels like "Done", use
            // small font.
            final FontMetrics fm;
            if (keyIsSpace) {
                paint.setTextSize(mKeyboardNameTextSize);
                paint.setTypeface(Typeface.DEFAULT_BOLD);
                if (mKeyboardNameFM == null)
                    mKeyboardNameFM = paint.getFontMetrics();
                fm = mKeyboardNameFM;
            } else if (label.length() > 1 && key.getCodesCount() < 2) {
                setPaintForLabelText(paint);
                if (mLabelFM == null)
                    mLabelFM = paint.getFontMetrics();
                fm = mLabelFM;
            } else {
                setPaintToKeyText(paint);
                if (mTextFM == null)
                    mTextFM = paint.getFontMetrics();
                fm = mTextFM;
            }

            if (isLabelOfPictographic(label)) {
                paint.setTextSize(2f * paint.getTextSize());
            }

            final float labelHeight = -fm.top;
            // Draw a drop shadow for the text
            paint.setShadowLayer(mShadowRadius, mShadowOffsetX, mShadowOffsetY, mShadowColor);

            final float textWidth = adjustTextSizeForLabel(paint, label, key.width);

            // the center of the drawable space, which is value used
            // previously for vertically
            // positioning the key label
            final float centerY = mKeyBackgroundPadding.top
                    + ((key.height - mKeyBackgroundPadding.top - mKeyBackgroundPadding.bottom)
                            / (keyIsSpace ? 3 : 2));// the label on the space is a bit higher

            // the X coordinate for the center of the main label text is
            // unaffected by the hints
            final float textX = mKeyBackgroundPadding.left
                    + (key.width - mKeyBackgroundPadding.left - mKeyBackgroundPadding.right) / 2;
            final float textY;
            // Some devices (mostly pre-Honeycomb, have issues with RTL text
            // drawing.
            // Of course, there is no issue with a single character :)
            // so, we'll use the RTL secured drawing (via StaticLayout) for
            // labels.
            if (label.length() > 1 && !AnyApplication.getConfig().workaround_alwaysUseDrawText()) {
                // calculate Y coordinate of top of text based on center
                // location
                textY = centerY - ((labelHeight - paint.descent()) / 2);
                canvas.translate(textX, textY);
                // RTL fix. But it costs, let do it when in need (more than
                // 1 character)
                StaticLayout labelText = new StaticLayout(label, new TextPaint(paint), (int) textWidth,
                        Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
                labelText.draw(canvas);
            } else {
                // to get Y coordinate of baseline from center of text,
                // first add half the height (to get to
                // bottom of text), then subtract the part below the
                // baseline. Note that fm.top is negative.
                textY = centerY + ((labelHeight - paint.descent()) / 2);
                canvas.translate(textX, textY);
                canvas.drawText(label, 0, label.length(), 0, 0, paint);
            }
            canvas.translate(-textX, -textY);
            // (-)

            // Turn off drop shadow
            paint.setShadowLayer(0, 0, 0, 0);
        }

        if (drawHintText) {
            if ((key.popupCharacters != null && key.popupCharacters.length() > 0) || (key.popupResId != 0)
                    || (key.longPressCode != 0)) {
                Align oldAlign = paint.getTextAlign();

                String hintText = null;

                if (key.hintLabel != null && key.hintLabel.length() > 0) {
                    hintText = key.hintLabel.toString();
                    // it is the responsibility of the keyboard layout
                    // designer to ensure that they do
                    // not put too many characters in the hint label...
                } else if (key.longPressCode != 0) {
                    if (Character.isLetterOrDigit(key.longPressCode))
                        hintText = Character.toString((char) key.longPressCode);
                } else if (key.popupCharacters != null) {
                    final String hintString = key.popupCharacters.toString();
                    final int hintLength = hintString.length();
                    if (hintLength <= 3)
                        hintText = hintString;
                }

                // if hintText is still null, it means it didn't fit one of
                // the above
                // cases, so we should provide the hint using the default
                if (hintText == null) {
                    if (mHintOverflowLabel != null)
                        hintText = mHintOverflowLabel;
                    else {
                        // theme does not provide a defaultHintLabel
                        // use  if hints are above, ... if hints are
                        // below
                        // (to avoid being too close to main label/icon)
                        if (hintVAlign == Gravity.TOP)
                            hintText = "";
                        else
                            hintText = "...";
                    }
                }

                if (mKeyboard.isShifted())
                    hintText = hintText.toUpperCase(getKeyboard().getLocale());

                // now draw hint
                paint.setTypeface(Typeface.DEFAULT);
                paint.setColor(hintColor.getColorForState(drawableState, 0xFF000000));
                paint.setTextSize(mHintTextSize);
                // get the hint text font metrics so that we know the size
                // of the hint when
                // we try to position the main label (to try to make sure
                // they don't overlap)
                if (mHintTextFM == null) {
                    mHintTextFM = paint.getFontMetrics();
                }

                final float hintX;
                final float hintY;

                // the (float) 0.5 value is added or subtracted to just give
                // a little more room
                // in case the theme designer didn't account for the hint
                // label location
                if (hintAlign == Gravity.START) {
                    // left
                    paint.setTextAlign(Align.LEFT);
                    hintX = mKeyBackgroundPadding.left + 0.5f;
                } else if (hintAlign == Gravity.CENTER) {
                    // center
                    paint.setTextAlign(Align.CENTER);
                    hintX = mKeyBackgroundPadding.left
                            + (key.width - mKeyBackgroundPadding.left - mKeyBackgroundPadding.right) / 2;
                } else {
                    // right
                    paint.setTextAlign(Align.RIGHT);
                    hintX = key.width - mKeyBackgroundPadding.right - 0.5f;
                }

                if (hintVAlign == Gravity.TOP) {
                    // above
                    hintY = mKeyBackgroundPadding.top - mHintTextFM.top + 0.5f;
                } else {
                    // below
                    hintY = key.height - mKeyBackgroundPadding.bottom - mHintTextFM.bottom - 0.5f;
                }

                canvas.drawText(hintText, hintX, hintY, paint);
                paint.setTextAlign(oldAlign);
            }
        }

        canvas.translate(-key.x - kbdPaddingLeft, -key.y - kbdPaddingTop);
    }
    mInvalidatedKey = null;

    mDirtyRect.setEmpty();
}

From source file:com.anysoftkeyboard.keyboards.views.AnyKeyboardViewBase.java

@CallSuper
protected void onBufferDraw(Canvas canvas, final Paint paint) {
    if (mKeyboardChanged) {
        invalidateAllKeys();/*  w ww  .j a va  2s  .c o  m*/
        mKeyboardChanged = false;
    }

    canvas.getClipBounds(mDirtyRect);

    if (mKeyboard == null)
        return;

    final boolean drawKeyboardNameText = (mKeyboardNameTextSize > 1f)
            && AnyApplication.getConfig().getShowKeyboardNameText();

    final boolean drawHintText = (mHintTextSize > 1) && AnyApplication.getConfig().getShowHintTextOnKeys();

    final boolean useCustomKeyTextColor = false;
    // TODO: final boolean useCustomKeyTextColor =
    // AnyApplication.getConfig().getUseCustomTextColorOnKeys();
    final ColorStateList keyTextColor = useCustomKeyTextColor
            ? new ColorStateList(new int[][] { { 0 } }, new int[] { 0xFF6666FF })
            : mKeyTextColor;

    final boolean useCustomHintColor = drawHintText && false;
    // TODO: final boolean useCustomHintColor = drawHintText &&
    final ColorStateList hintColor = useCustomHintColor
            ? new ColorStateList(new int[][] { { 0 } }, new int[] { 0xFFFF6666 })
            : mHintTextColor;

    // allow preferences to override theme settings for hint text position
    final boolean useCustomHintAlign = drawHintText && AnyApplication.getConfig().getUseCustomHintAlign();
    final int hintAlign = useCustomHintAlign ? AnyApplication.getConfig().getCustomHintAlign()
            : mHintLabelAlign;
    final int hintVAlign = useCustomHintAlign ? AnyApplication.getConfig().getCustomHintVAlign()
            : mHintLabelVAlign;

    final Drawable keyBackground = mKeyBackground;
    final Rect clipRegion = mClipRegion;
    final int kbdPaddingLeft = getPaddingLeft();
    final int kbdPaddingTop = getPaddingTop();
    final Key[] keys = mKeys;
    final Key invalidKey = mInvalidatedKey;

    boolean drawSingleKey = false;
    if (invalidKey != null && canvas.getClipBounds(clipRegion)) {
        // TODO we should use Rect.inset and Rect.contains here.
        // Is clipRegion completely contained within the invalidated key?
        if (invalidKey.x + kbdPaddingLeft - 1 <= clipRegion.left
                && invalidKey.y + kbdPaddingTop - 1 <= clipRegion.top
                && invalidKey.x + invalidKey.width + kbdPaddingLeft + 1 >= clipRegion.right
                && invalidKey.y + invalidKey.height + kbdPaddingTop + 1 >= clipRegion.bottom) {
            drawSingleKey = true;
        }
    }

    for (Key keyBase : keys) {
        final AnyKey key = (AnyKey) keyBase;
        final boolean keyIsSpace = isSpaceKey(key);

        if (drawSingleKey && (invalidKey != key)) {
            continue;
        }
        if (!mDirtyRect.intersects(key.x + kbdPaddingLeft, key.y + kbdPaddingTop,
                key.x + key.width + kbdPaddingLeft, key.y + key.height + kbdPaddingTop)) {
            continue;
        }
        int[] drawableState = key.getCurrentDrawableState(mDrawableStatesProvider);

        if (keyIsSpace)
            paint.setColor(mKeyboardNameTextColor);
        else
            paint.setColor(keyTextColor.getColorForState(drawableState, 0xFF000000));
        keyBackground.setState(drawableState);

        // Switch the character to uppercase if shift is pressed
        CharSequence label = key.label == null ? null : adjustLabelToShiftState(key);

        final Rect bounds = keyBackground.getBounds();
        if ((key.width != bounds.right) || (key.height != bounds.bottom)) {
            keyBackground.setBounds(0, 0, key.width, key.height);
        }
        canvas.translate(key.x + kbdPaddingLeft, key.y + kbdPaddingTop);
        keyBackground.draw(canvas);

        if (TextUtils.isEmpty(label)) {
            Drawable iconToDraw = getIconToDrawForKey(key, false);
            if (iconToDraw != null/* && shouldDrawIcon */) {
                //http://developer.android.com/reference/android/graphics/drawable/Drawable.html#getCurrent()
                //http://stackoverflow.com/a/103600/1324235
                final boolean is9Patch = iconToDraw.getCurrent() instanceof NinePatchDrawable;

                // Special handing for the upper-right number hint icons
                final int drawableWidth;
                final int drawableHeight;
                final int drawableX;
                final int drawableY;

                drawableWidth = is9Patch ? key.width : iconToDraw.getIntrinsicWidth();
                drawableHeight = is9Patch ? key.height : iconToDraw.getIntrinsicHeight();
                drawableX = (key.width + mKeyBackgroundPadding.left - mKeyBackgroundPadding.right
                        - drawableWidth) / 2;
                drawableY = (key.height + mKeyBackgroundPadding.top - mKeyBackgroundPadding.bottom
                        - drawableHeight) / 2;

                canvas.translate(drawableX, drawableY);
                iconToDraw.setBounds(0, 0, drawableWidth, drawableHeight);
                iconToDraw.draw(canvas);
                canvas.translate(-drawableX, -drawableY);
                if (keyIsSpace && drawKeyboardNameText) {
                    // now a little hack, I'll set the label now, so it get
                    // drawn.
                    label = mKeyboardName;
                }
            } else {
                // ho... no icon.
                // I'll try to guess the text
                label = guessLabelForKey(key.getPrimaryCode());
            }
        }

        if (label != null) {
            // For characters, use large font. For labels like "Done", use
            // small font.
            final FontMetrics fm;
            if (keyIsSpace) {
                paint.setTextSize(mKeyboardNameTextSize);
                paint.setTypeface(Typeface.DEFAULT_BOLD);
                if (mKeyboardNameFontMetrics == null)
                    mKeyboardNameFontMetrics = paint.getFontMetrics();
                fm = mKeyboardNameFontMetrics;
            } else if (label.length() > 1 && key.getCodesCount() < 2) {
                setPaintForLabelText(paint);
                if (mLabelFontMetrics == null)
                    mLabelFontMetrics = paint.getFontMetrics();
                fm = mLabelFontMetrics;
            } else {
                setPaintToKeyText(paint);
                if (mTextFontMetrics == null)
                    mTextFontMetrics = paint.getFontMetrics();
                fm = mTextFontMetrics;
            }

            if (isLabelOfPictographic(label)) {
                paint.setTextSize(2f * paint.getTextSize());
            }

            final float labelHeight = -fm.top;
            // Draw a drop shadow for the text
            paint.setShadowLayer(mShadowRadius, mShadowOffsetX, mShadowOffsetY, mShadowColor);

            final float textWidth = adjustTextSizeForLabel(paint, label, key.width);

            // the center of the drawable space, which is value used
            // previously for vertically
            // positioning the key label
            final float centerY = mKeyBackgroundPadding.top
                    + ((key.height - mKeyBackgroundPadding.top - mKeyBackgroundPadding.bottom)
                            / (keyIsSpace ? 3 : 2));// the label on the space is a bit higher

            // the X coordinate for the center of the main label text is
            // unaffected by the hints
            final float textX = mKeyBackgroundPadding.left
                    + (key.width - mKeyBackgroundPadding.left - mKeyBackgroundPadding.right) / 2;
            final float textY;
            // Some devices (mostly pre-Honeycomb, have issues with RTL text
            // drawing.
            // Of course, there is no issue with a single character :)
            // so, we'll use the RTL secured drawing (via StaticLayout) for
            // labels.
            if (label.length() > 1 && !AnyApplication.getConfig().workaround_alwaysUseDrawText()) {
                // calculate Y coordinate of top of text based on center
                // location
                textY = centerY - ((labelHeight - paint.descent()) / 2);
                canvas.translate(textX, textY);
                // RTL fix. But it costs, let do it when in need (more than
                // 1 character)
                StaticLayout labelText = new StaticLayout(label, new TextPaint(paint), (int) textWidth,
                        Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
                labelText.draw(canvas);
            } else {
                // to get Y coordinate of baseline from center of text,
                // first add half the height (to get to
                // bottom of text), then subtract the part below the
                // baseline. Note that fm.top is negative.
                textY = centerY + ((labelHeight - paint.descent()) / 2);
                canvas.translate(textX, textY);
                canvas.drawText(label, 0, label.length(), 0, 0, paint);
            }
            canvas.translate(-textX, -textY);
            // (-)

            // Turn off drop shadow
            paint.setShadowLayer(0, 0, 0, 0);
        }

        if (drawHintText) {
            if ((key.popupCharacters != null && key.popupCharacters.length() > 0) || (key.popupResId != 0)
                    || (key.longPressCode != 0)) {
                Align oldAlign = paint.getTextAlign();

                String hintText = null;

                if (key.hintLabel != null && key.hintLabel.length() > 0) {
                    hintText = key.hintLabel.toString();
                    // it is the responsibility of the keyboard layout
                    // designer to ensure that they do
                    // not put too many characters in the hint label...
                } else if (key.longPressCode != 0) {
                    if (Character.isLetterOrDigit(key.longPressCode))
                        hintText = Character.toString((char) key.longPressCode);
                } else if (key.popupCharacters != null) {
                    final String hintString = key.popupCharacters.toString();
                    final int hintLength = hintString.length();
                    if (hintLength <= 3)
                        hintText = hintString;
                }

                // if hintText is still null, it means it didn't fit one of
                // the above
                // cases, so we should provide the hint using the default
                if (hintText == null) {
                    if (mHintOverflowLabel != null)
                        hintText = mHintOverflowLabel;
                    else {
                        // theme does not provide a defaultHintLabel
                        // use  if hints are above, ... if hints are
                        // below
                        // (to avoid being too close to main label/icon)
                        if (hintVAlign == Gravity.TOP)
                            hintText = "";
                        else
                            hintText = "...";
                    }
                }

                if (mKeyboard.isShifted())
                    hintText = hintText.toUpperCase(getKeyboard().getLocale());

                // now draw hint
                paint.setTypeface(Typeface.DEFAULT);
                paint.setColor(hintColor.getColorForState(drawableState, 0xFF000000));
                paint.setTextSize(mHintTextSize);
                // get the hint text font metrics so that we know the size
                // of the hint when
                // we try to position the main label (to try to make sure
                // they don't overlap)
                if (mHintTextFontMetrics == null) {
                    mHintTextFontMetrics = paint.getFontMetrics();
                }

                final float hintX;
                final float hintY;

                // the (float) 0.5 value is added or subtracted to just give
                // a little more room
                // in case the theme designer didn't account for the hint
                // label location
                if (hintAlign == Gravity.START) {
                    // left
                    paint.setTextAlign(Align.LEFT);
                    hintX = mKeyBackgroundPadding.left + 0.5f;
                } else if (hintAlign == Gravity.CENTER) {
                    // center
                    paint.setTextAlign(Align.CENTER);
                    hintX = mKeyBackgroundPadding.left
                            + (key.width - mKeyBackgroundPadding.left - mKeyBackgroundPadding.right) / 2;
                } else {
                    // right
                    paint.setTextAlign(Align.RIGHT);
                    hintX = key.width - mKeyBackgroundPadding.right - 0.5f;
                }

                if (hintVAlign == Gravity.TOP) {
                    // above
                    hintY = mKeyBackgroundPadding.top - mHintTextFontMetrics.top + 0.5f;
                } else {
                    // below
                    hintY = key.height - mKeyBackgroundPadding.bottom - mHintTextFontMetrics.bottom - 0.5f;
                }

                canvas.drawText(hintText, hintX, hintY, paint);
                paint.setTextAlign(oldAlign);
            }
        }

        canvas.translate(-key.x - kbdPaddingLeft, -key.y - kbdPaddingTop);
    }
    mInvalidatedKey = null;

    mDirtyRect.setEmpty();
}