Java tutorial
/* * Copyright (C) 2015 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.support.design.widget; import android.content.Context; import android.content.res.ColorStateList; import android.graphics.Color; import android.graphics.PorterDuff; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.graphics.drawable.GradientDrawable; import android.support.annotation.Nullable; import android.support.design.R; import android.support.v4.content.ContextCompat; import android.view.View; import android.view.ViewTreeObserver; import android.view.animation.Interpolator; abstract class FloatingActionButtonImpl { static final Interpolator ANIM_INTERPOLATOR = AnimationUtils.FAST_OUT_LINEAR_IN_INTERPOLATOR; static final long PRESSED_ANIM_DURATION = 100; static final long PRESSED_ANIM_DELAY = 100; static final int ANIM_STATE_NONE = 0; static final int ANIM_STATE_HIDING = 1; static final int ANIM_STATE_SHOWING = 2; int mAnimState = ANIM_STATE_NONE; Drawable mShapeDrawable; Drawable mRippleDrawable; CircularBorderDrawable mBorderDrawable; Drawable mContentBackground; float mElevation; float mPressedTranslationZ; interface InternalVisibilityChangedListener { public void onShown(); public void onHidden(); } static final int SHOW_HIDE_ANIM_DURATION = 200; static final int[] PRESSED_ENABLED_STATE_SET = { android.R.attr.state_pressed, android.R.attr.state_enabled }; static final int[] FOCUSED_ENABLED_STATE_SET = { android.R.attr.state_focused, android.R.attr.state_enabled }; static final int[] ENABLED_STATE_SET = { android.R.attr.state_enabled }; static final int[] EMPTY_STATE_SET = new int[0]; final VisibilityAwareImageButton mView; final ShadowViewDelegate mShadowViewDelegate; final ValueAnimatorCompat.Creator mAnimatorCreator; private final Rect mTmpRect = new Rect(); private ViewTreeObserver.OnPreDrawListener mPreDrawListener; FloatingActionButtonImpl(VisibilityAwareImageButton view, ShadowViewDelegate shadowViewDelegate, ValueAnimatorCompat.Creator animatorCreator) { mView = view; mShadowViewDelegate = shadowViewDelegate; mAnimatorCreator = animatorCreator; } abstract void setBackgroundDrawable(ColorStateList backgroundTint, PorterDuff.Mode backgroundTintMode, int rippleColor, int borderWidth); abstract void setBackgroundTintList(ColorStateList tint); abstract void setBackgroundTintMode(PorterDuff.Mode tintMode); abstract void setRippleColor(int rippleColor); final void setElevation(float elevation) { if (mElevation != elevation) { mElevation = elevation; onElevationsChanged(elevation, mPressedTranslationZ); } } abstract float getElevation(); final void setPressedTranslationZ(float translationZ) { if (mPressedTranslationZ != translationZ) { mPressedTranslationZ = translationZ; onElevationsChanged(mElevation, translationZ); } } abstract void onElevationsChanged(float elevation, float pressedTranslationZ); abstract void onDrawableStateChanged(int[] state); abstract void jumpDrawableToCurrentState(); abstract void hide(@Nullable InternalVisibilityChangedListener listener, boolean fromUser); abstract void show(@Nullable InternalVisibilityChangedListener listener, boolean fromUser); final Drawable getContentBackground() { return mContentBackground; } abstract void onCompatShadowChanged(); final void updatePadding() { Rect rect = mTmpRect; getPadding(rect); onPaddingUpdated(rect); mShadowViewDelegate.setShadowPadding(rect.left, rect.top, rect.right, rect.bottom); } abstract void getPadding(Rect rect); void onPaddingUpdated(Rect padding) { } void onAttachedToWindow() { if (requirePreDrawListener()) { ensurePreDrawListener(); mView.getViewTreeObserver().addOnPreDrawListener(mPreDrawListener); } } void onDetachedFromWindow() { if (mPreDrawListener != null) { mView.getViewTreeObserver().removeOnPreDrawListener(mPreDrawListener); mPreDrawListener = null; } } boolean requirePreDrawListener() { return false; } CircularBorderDrawable createBorderDrawable(int borderWidth, ColorStateList backgroundTint) { final Context context = mView.getContext(); CircularBorderDrawable borderDrawable = newCircularDrawable(); borderDrawable.setGradientColors(ContextCompat.getColor(context, R.color.design_fab_stroke_top_outer_color), ContextCompat.getColor(context, R.color.design_fab_stroke_top_inner_color), ContextCompat.getColor(context, R.color.design_fab_stroke_end_inner_color), ContextCompat.getColor(context, R.color.design_fab_stroke_end_outer_color)); borderDrawable.setBorderWidth(borderWidth); borderDrawable.setBorderTint(backgroundTint); return borderDrawable; } CircularBorderDrawable newCircularDrawable() { return new CircularBorderDrawable(); } void onPreDraw() { } private void ensurePreDrawListener() { if (mPreDrawListener == null) { mPreDrawListener = new ViewTreeObserver.OnPreDrawListener() { @Override public boolean onPreDraw() { FloatingActionButtonImpl.this.onPreDraw(); return true; } }; } } GradientDrawable createShapeDrawable() { GradientDrawable d = newGradientDrawableForShape(); d.setShape(GradientDrawable.OVAL); d.setColor(Color.WHITE); return d; } GradientDrawable newGradientDrawableForShape() { return new GradientDrawable(); } boolean isOrWillBeShown() { if (mView.getVisibility() != View.VISIBLE) { // If we not currently visible, return true if we're animating to be shown return mAnimState == ANIM_STATE_SHOWING; } else { // Otherwise if we're visible, return true if we're not animating to be hidden return mAnimState != ANIM_STATE_HIDING; } } boolean isOrWillBeHidden() { if (mView.getVisibility() == View.VISIBLE) { // If we currently visible, return true if we're animating to be hidden return mAnimState == ANIM_STATE_HIDING; } else { // Otherwise if we're not visible, return true if we're not animating to be shown return mAnimState != ANIM_STATE_SHOWING; } } }