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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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.intellij.ui;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.util.Comparing;
import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.registry.Registry;
import com.intellij.ui.awt.RelativePoint;
import com.intellij.ui.popup.AbstractPopup;
import com.intellij.util.Alarm;
import com.intellij.util.JBHiDPIScaledImage;
import com.intellij.util.ui.UIUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.util.Collection;
import java.util.Collections;
public abstract class AbstractExpandableItemsHandler<KeyType, ComponentType extends JComponent> implements ExpandableItemsHandler<KeyType> {
protected final ComponentType myComponent;
private final Alarm myUpdateAlarm = new Alarm(Alarm.ThreadToUse.SWING_THREAD);
private final CellRendererPane myRendererPane = new CellRendererPane();
private final TipComponent myTipComponent;
private boolean myEnabled = Registry.is("ide.expansion.hints.enabled");
private Hint myHint;
private KeyType myKey;
private Rectangle myKeyItemBounds;
private BufferedImage myImage;
protected AbstractExpandableItemsHandler(@NotNull final ComponentType component) {
myComponent = component;
myComponent.add(myRendererPane);
myComponent.validate();
myTipComponent = new TipComponent();
MouseAdapter tipMouseAdapter = new MouseAdapter() {
@Override
public void mouseExited(MouseEvent e) {
// don't hide the hint if mouse exited to myComponent
if (myComponent.getMousePosition() == null) {
hideHint();
}
}
@Override
public void mouseWheelMoved(MouseWheelEvent e) {
Point p = e.getLocationOnScreen();
SwingUtilities.convertPointFromScreen(p, myComponent);
myComponent.dispatchEvent(new MouseWheelEvent(myComponent,
e.getID(),
e.getWhen(),
e.getModifiers(),
p.x, p.y,
e.getClickCount(),
e.isPopupTrigger(),
e.getScrollType(),
e.getScrollAmount(),
e.getWheelRotation()));
}
@Override
public void mouseClicked(MouseEvent e) {
Point p = e.getLocationOnScreen();
SwingUtilities.convertPointFromScreen(p, myComponent);
myComponent.dispatchEvent(new MouseEvent(myComponent,
e.getID(),
e.getWhen(),
e.getModifiers(),
p.x, p.y,
e.getClickCount(),
e.isPopupTrigger(),
e.getButton()));
}
@Override
public void mousePressed(MouseEvent e) {
mouseClicked(e);
}
@Override
public void mouseReleased(MouseEvent e) {
mouseClicked(e);
}
@Override
public void mouseMoved(MouseEvent e) {
mouseClicked(e);
}
@Override
public void mouseDragged(MouseEvent e) {
mouseClicked(e);
}
};
myTipComponent.addMouseListener(tipMouseAdapter);
myTipComponent.addMouseWheelListener(tipMouseAdapter);
myTipComponent.addMouseMotionListener(tipMouseAdapter);
myComponent.addMouseListener(
new MouseListener() {
@Override
public void mouseEntered(MouseEvent e) {
handleMouseEvent(e);
}
@Override
public void mouseExited(MouseEvent e) {
// don't hide the hint if mouse exited to it
if (myTipComponent.getMousePosition() == null) {
hideHint();
}
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
handleMouseEvent(e);
}
@Override
public void mouseReleased(MouseEvent e) {
handleMouseEvent(e);
}
}
);
myComponent.addMouseMotionListener(
new MouseMotionListener() {
@Override
public void mouseDragged(MouseEvent e) {
handleMouseEvent(e);
}
@Override
public void mouseMoved(MouseEvent e) {
handleMouseEvent(e, false);
}
}
);
myComponent.addFocusListener(
new FocusAdapter() {
@Override
public void focusLost(FocusEvent e) {
onFocusLost();
}
@Override
public void focusGained(FocusEvent e) {
updateCurrentSelection();
}
}
);
myComponent.addComponentListener(
new ComponentAdapter() {
@Override
public void componentHidden(ComponentEvent e) {
hideHint();
}
@Override
public void componentMoved(ComponentEvent e) {
updateCurrentSelection();
}
@Override
public void componentResized(ComponentEvent e) {
updateCurrentSelection();
}
}
);
myComponent.addHierarchyBoundsListener(new HierarchyBoundsAdapter() {
@Override
public void ancestorMoved(HierarchyEvent e) {
updateCurrentSelection();
}
@Override
public void ancestorResized(HierarchyEvent e) {
updateCurrentSelection();
}
});
myComponent.addHierarchyListener(
new HierarchyListener() {
@Override
public void hierarchyChanged(HierarchyEvent e) {
hideHint();
}
}
);
}
protected void onFocusLost() {
hideHint();
}
@Override
public void setEnabled(boolean enabled) {
myEnabled = enabled;
if (!myEnabled) hideHint();
}
@Override
public boolean isEnabled() {
return myEnabled;
}
@NotNull
@Override
public Collection<KeyType> getExpandedItems() {
return myKey == null ? Collections.<KeyType>emptyList() : Collections.singleton(myKey);
}
protected void updateCurrentSelection() {
handleSelectionChange(myKey, true);
}
private void handleMouseEvent(MouseEvent e) {
handleMouseEvent(e, true);
}
protected void handleMouseEvent(MouseEvent e, boolean forceUpdate) {
KeyType selected = getCellKeyForPoint(e.getPoint());
if (forceUpdate || !Comparing.equal(myKey, selected)) {
handleSelectionChange(selected, true);
}
}
protected void handleSelectionChange(KeyType selected) {
handleSelectionChange(selected, false);
}
protected void handleSelectionChange(final KeyType selected, final boolean processIfUnfocused) {
if (!ApplicationManager.getApplication().isDispatchThread()) {
return;
}
myUpdateAlarm.cancelAllRequests();
myUpdateAlarm.addRequest(new Runnable() {
@Override
public void run() {
doHandleSelectionChange(selected, processIfUnfocused);
}
}, 10);
}
private void doHandleSelectionChange(KeyType selected, boolean processIfUnfocused) {
if (!myEnabled) return;
if (selected == null
|| !myComponent.isEnabled()
|| !myComponent.isShowing()
|| !myComponent.getVisibleRect().intersects(getVisibleRect(selected))
|| !myComponent.isFocusOwner() && !processIfUnfocused
|| isPopup()) {
hideHint();
return;
}
if (!Comparing.equal(myKey, selected)) {
hideHint();
}
myKey = selected;
Point location = createToolTipImage(myKey);
if (location == null) {
hideHint();
}
else if (myHint == null) {
showHint(location);
}
else {
repaintHint(location);
}
}
protected boolean isPopup() {
Window window = SwingUtilities.getWindowAncestor(myComponent);
return window != null
&& !(window instanceof Dialog || window instanceof Frame)
&& !isHintsAllowed(window);
}
private static boolean isHintsAllowed(Window window) {
if (window instanceof RootPaneContainer) {
final JRootPane pane = ((RootPaneContainer)window).getRootPane();
if (pane != null) {
return Boolean.TRUE.equals(pane.getClientProperty(AbstractPopup.SHOW_HINTS));
}
}
return false;
}
private void hideHint() {
myUpdateAlarm.cancelAllRequests();
if (myHint != null) {
myHint.hide();
myHint = null;
repaintKeyItem();
}
myKey = null;
}
public boolean isShowing() {
return myHint != null && myHint.isVisible();
}
private void showHint(Point location) {
assert myHint == null;
if (!myComponent.isShowing()) {
return;
}
myHint = new ExpansionHint(myTipComponent);
myHint.show(myComponent, location.x, location.y, myComponent, new HintHint(myComponent, location));
repaintKeyItem();
}
private void repaintHint(Point location) {
if (myHint != null && myKey != null && myComponent.isShowing()) {
myHint.setLocation(new RelativePoint(myComponent, location));
myTipComponent.repaint();
repaintKeyItem();
}
}
private void repaintKeyItem() {
if (myKeyItemBounds != null) {
myComponent.repaint(myKeyItemBounds);
}
}
@Nullable
private Point createToolTipImage(@NotNull KeyType key) {
Pair<Component, Rectangle> rendererAndBounds = getCellRendererAndBounds(key);
if (rendererAndBounds == null) return null;
Component renderer = rendererAndBounds.first;
if (!(renderer instanceof JComponent)) return null;
myKeyItemBounds = rendererAndBounds.second;
Rectangle cellBounds = myKeyItemBounds;
Rectangle visibleRect = getVisibleRect(key);
int width = cellBounds.x + cellBounds.width - (visibleRect.x + visibleRect.width);
int height = cellBounds.height;
if (width <= 0 || height <= 0) return null;
if (cellBounds.y < visibleRect.y) return null;
if (cellBounds.y + cellBounds.height > visibleRect.y + visibleRect.height) return null;
Dimension size = getImageSize(width, height);
myImage = UIUtil.createImage(size.width, size.height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = myImage.createGraphics();
g.setClip(null);
doFillBackground(height, width, g);
g.translate(-(visibleRect.x + visibleRect.width - cellBounds.x), 0);
doPaintTooltipImage(renderer, cellBounds, g, key);
if (isPaintBorder()) {
g.translate(visibleRect.x + visibleRect.width - cellBounds.x, 0);
g.setColor(getBorderColor());
int rightX = size.width - 1;
int h = size.height;
UIUtil.drawLine(g, 0, 0, rightX, 0);
UIUtil.drawLine(g, rightX, 0, rightX, h - 1);
UIUtil.drawLine(g, 0, h - 1, rightX, h - 1);
}
g.dispose();
myRendererPane.remove(renderer);
return new Point(visibleRect.x + visibleRect.width, cellBounds.y);
}
protected boolean isPaintBorder() {
return true;
}
protected Color getBorderColor() {
return UIUtil.getListSelectionBackground();
}
protected Dimension getImageSize(final int width, final int height) {
return new Dimension(width, height);
}
protected void doFillBackground(int height, int width, Graphics2D g) {
g.setColor(myComponent.getBackground());
g.fillRect(0, 0, width, height);
}
protected void doPaintTooltipImage(Component rComponent, Rectangle cellBounds, Graphics2D g, KeyType key) {
myRendererPane.paintComponent(g, rComponent, myComponent, 0, 0, cellBounds.width, cellBounds.height, true);
}
protected Rectangle getVisibleRect(KeyType key) {
return myComponent.getVisibleRect();
}
@Nullable
protected abstract Pair<Component, Rectangle> getCellRendererAndBounds(KeyType key);
protected abstract KeyType getCellKeyForPoint(Point point);
private class TipComponent extends JComponent {
@Override
public Dimension getMaximumSize() {
return getPreferredSize();
}
@Override
public Dimension getMinimumSize() {
return getPreferredSize();
}
@Override
public Dimension getPreferredSize() {
int w = myImage.getWidth();
int h = myImage.getHeight();
if (myImage instanceof JBHiDPIScaledImage) {
w /= 2; h /= 2;
}
return new Dimension(w, h);
}
@Override
public void paint(Graphics g) {
UIUtil.drawImage(g, myImage, 0, 0, null);
}
}
}
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