Java tutorial
/* * Copyright 2014-2016 See AUTHORS file. * * 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 com.kotcrab.vis.ui.widget; import com.badlogic.gdx.graphics.Color; import com.badlogic.gdx.graphics.g2d.Batch; import com.badlogic.gdx.scenes.scene2d.InputEvent; import com.badlogic.gdx.scenes.scene2d.InputListener; import com.badlogic.gdx.scenes.scene2d.ui.Button; import com.badlogic.gdx.scenes.scene2d.ui.Cell; import com.badlogic.gdx.scenes.scene2d.ui.Image; import com.badlogic.gdx.scenes.scene2d.ui.ImageButton; import com.badlogic.gdx.scenes.scene2d.utils.ChangeListener; import com.badlogic.gdx.scenes.scene2d.utils.ClickListener; import com.badlogic.gdx.scenes.scene2d.utils.Drawable; import com.badlogic.gdx.utils.Scaling; import com.kotcrab.vis.ui.FocusManager; import com.kotcrab.vis.ui.Focusable; import com.kotcrab.vis.ui.VisUI; import com.kotcrab.vis.ui.util.BorderOwner; /** * Due to scope of changes made this widget is not compatible with standard {@link ImageButton}. * <p> * When listening for button press {@link ChangeListener} should be always preferred (instead of {@link ClickListener}). * {@link ClickListener} does not support disabling button and will still report button presses. * @author Kotcrab * @see ImageButton */ public class VisImageButton extends Button implements Focusable, BorderOwner { private Image image; private VisImageButtonStyle style; private boolean drawBorder; private boolean focusBorderEnabled = true; private boolean generateDisabledImage = false; public VisImageButton(Drawable imageUp) { this(imageUp, null, null); } public VisImageButton(Drawable imageUp, String tooltipText) { this(imageUp, null, null); if (tooltipText != null) new Tooltip.Builder(tooltipText).target(this).build(); } public VisImageButton(Drawable imageUp, Drawable imageDown) { this(imageUp, imageDown, null); } public VisImageButton(Drawable imageUp, Drawable imageDown, Drawable imageChecked) { super(new VisImageButtonStyle(VisUI.getSkin().get(VisImageButtonStyle.class))); style.imageUp = imageUp; style.imageDown = imageDown; style.imageChecked = imageChecked; init(); } public VisImageButton(String styleName) { super(new VisImageButtonStyle(VisUI.getSkin().get(styleName, VisImageButtonStyle.class))); init(); } public VisImageButton(VisImageButtonStyle style) { super(style); init(); } private void init() { image = new Image(); image.setScaling(Scaling.fit); add(image); setSize(getPrefWidth(), getPrefHeight()); addListener(new InputListener() { @Override public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) { if (isDisabled() == false) FocusManager.switchFocus(getStage(), VisImageButton.this); return false; } }); updateImage(); } public void setGenerateDisabledImage(boolean generate) { generateDisabledImage = generate; } @Override public VisImageButtonStyle getStyle() { return style; } @Override public void setStyle(ButtonStyle style) { if (!(style instanceof VisImageButtonStyle)) throw new IllegalArgumentException("style must be an ImageButtonStyle."); super.setStyle(style); this.style = (VisImageButtonStyle) style; if (image != null) updateImage(); } private void updateImage() { Drawable drawable = null; if (isDisabled() && style.imageDisabled != null) drawable = style.imageDisabled; else if (isPressed() && style.imageDown != null) drawable = style.imageDown; else if (isChecked() && style.imageChecked != null) drawable = (style.imageCheckedOver != null && isOver()) ? style.imageCheckedOver : style.imageChecked; else if (isOver() && style.imageOver != null) drawable = style.imageOver; else if (style.imageUp != null) // drawable = style.imageUp; image.setDrawable(drawable); if (generateDisabledImage && style.imageDisabled == null && isDisabled()) image.setColor(Color.GRAY); else image.setColor(Color.WHITE); } @Override public void draw(Batch batch, float parentAlpha) { updateImage(); super.draw(batch, parentAlpha); if (focusBorderEnabled && drawBorder && style.focusBorder != null) style.focusBorder.draw(batch, getX(), getY(), getWidth(), getHeight()); } public Image getImage() { return image; } public Cell<?> getImageCell() { return getCell(image); } @Override public void setDisabled(boolean disabled) { super.setDisabled(disabled); if (disabled) FocusManager.resetFocus(getStage(), this); } @Override public void focusLost() { drawBorder = false; } @Override public void focusGained() { drawBorder = true; } @Override public boolean isFocusBorderEnabled() { return focusBorderEnabled; } @Override public void setFocusBorderEnabled(boolean focusBorderEnabled) { this.focusBorderEnabled = focusBorderEnabled; } /** * The style for an image button, see {@link ImageButton}. * @author Nathan Sweet */ static public class VisImageButtonStyle extends ButtonStyle { /** Optional. */ public Drawable imageUp, imageDown, imageOver, imageChecked, imageCheckedOver, imageDisabled; public Drawable focusBorder; public VisImageButtonStyle() { } public VisImageButtonStyle(Drawable up, Drawable down, Drawable checked, Drawable imageUp, Drawable imageDown, Drawable imageChecked) { super(up, down, checked); this.imageUp = imageUp; this.imageDown = imageDown; this.imageChecked = imageChecked; } public VisImageButtonStyle(VisImageButtonStyle style) { super(style); this.imageUp = style.imageUp; this.imageDown = style.imageDown; this.imageOver = style.imageOver; this.imageChecked = style.imageChecked; this.imageCheckedOver = style.imageCheckedOver; this.imageDisabled = style.imageDisabled; this.focusBorder = style.focusBorder; } } }