?? titlebarbutton.java
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package org.test.custom.internal;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.test.custom.shell.InternalShell;
public class TitleBarButton extends CustomDrawnButton {
private final Color highlightShadowColor, lightShadowColor,
normalShadowColor, darkShadowColor;
private final Color gradEndColor, inactiveGradEndColor,
widgetBackgroundColor, widgetForegroundColor;
private final int style;
private final Shell shell;
private final Display display;
private final InternalShell ishell;
private int leftOff, rightOff;
public TitleBarButton(InternalShell parent, int style) {
super(parent, SWT.NO_FOCUS | SWT.NO_BACKGROUND);
this.style = style;
this.shell = getShell();
this.display = getDisplay();
this.ishell = parent;
// 獲得控件在不同情況下的顏色
highlightShadowColor = display
.getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW);
lightShadowColor = display
.getSystemColor(SWT.COLOR_WIDGET_LIGHT_SHADOW);
normalShadowColor = display
.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
darkShadowColor = display.getSystemColor(SWT.COLOR_WIDGET_DARK_SHADOW);
gradEndColor = display
.getSystemColor(SWT.COLOR_TITLE_BACKGROUND_GRADIENT);
inactiveGradEndColor = display
.getSystemColor(SWT.COLOR_TITLE_INACTIVE_BACKGROUND_GRADIENT);
widgetBackgroundColor = display
.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND);
widgetForegroundColor = display
.getSystemColor(SWT.COLOR_WIDGET_FOREGROUND);
if ((style & (SWT.CLOSE | SWT.MAX)) != 0)
rightOff = 2;
else
leftOff = 2;
// 注冊事件偵聽器
final Listener activateListener = new Listener() {
public void handleEvent(Event event) {
redraw();
}
};
final Listener deactivateListener = new Listener() {
public void handleEvent(Event event) {
redraw();
}
};
shell.addListener(SWT.Activate, activateListener);
shell.addListener(SWT.Deactivate, deactivateListener);
addListener(SWT.Dispose, new Listener() {
public void handleEvent(Event event) {
shell.removeListener(SWT.Activate, activateListener);
shell.removeListener(SWT.Deactivate, deactivateListener);
}
});
}
// 返回控件樣式
public int getStyle() {
return style;
}
// 實現父類的抽象方法
protected void onPaint(Event event, boolean pressed) {
Point size = getSize();
boolean active = (shell == display.getActiveShell() && ishell
.isActiveShell());
GC gc = event.gc;
// 設置背景顏色
gc.setBackground(active ? gradEndColor : inactiveGradEndColor);
gc.fillRectangle(0, 0, size.x, size.y);
gc.setBackground(widgetBackgroundColor);
gc.fillRectangle(2, 4, size.x - 4, size.y - 6);
Color tloColor, tliColor, broColor, briColor;
int pOff;
// 根據按鈕的狀態設置它的顏色
if (pressed) {
tloColor = darkShadowColor;
tliColor = normalShadowColor;
broColor = highlightShadowColor;
briColor = lightShadowColor;
pOff = 1;
} else {
tloColor = highlightShadowColor;
tliColor = lightShadowColor;
broColor = darkShadowColor;
briColor = normalShadowColor;
pOff = 0;
}
drawBevelRect(gc, leftOff, 2, size.x - 1 - leftOff - rightOff,
size.y - 5, tloColor, broColor);
drawBevelRect(gc, 1 + leftOff, 3, size.x - 3 - leftOff - rightOff,
size.y - 7, tliColor, briColor);
// 根據控件是否能用設置它的顏色
if (isEnabled()) {
gc.setForeground(widgetForegroundColor);
drawImage(gc, size, pOff);
} else {
gc.setForeground(highlightShadowColor);
drawImage(gc, size, 1);
gc.setForeground(normalShadowColor);
drawImage(gc, size, 0);
}
}
// 畫出圖形按鈕
private void drawImage(GC gc, Point size, int pOff) {
if ((style & SWT.CLOSE) != 0)
drawCloseImage(gc, size, pOff);
else if ((style & SWT.MAX) != 0) {
if (ishell.getMaximized())
drawRestoreImage(gc, size, pOff);
else
drawMaximizeImage(gc, size, pOff);
} else if ((style & SWT.MIN) != 0)
drawMinimizeImage(gc, size, pOff);
}
private static void drawBevelRect(GC gc, int x, int y, int w, int h,
Color topleft, Color bottomright) {
gc.setForeground(bottomright);
gc.drawLine(x + w, y, x + w, y + h);
gc.drawLine(x, y + h, x + w, y + h);
gc.setForeground(topleft);
gc.drawLine(x, y, x + w - 1, y);
gc.drawLine(x, y, x, y + h - 1);
}
// 畫出關閉按鈕的圖形
private void drawCloseImage(GC gc, Point size, int pOff) {
gc.drawLine(pOff + leftOff + 4, pOff + 5, pOff + size.x - leftOff
- rightOff - 6, pOff + size.y - 7);
gc.drawLine(pOff + leftOff + 5, pOff + 5, pOff + size.x - leftOff
- rightOff - 5, pOff + size.y - 7);
gc.drawLine(pOff + leftOff + 4, pOff + size.y - 7, pOff + size.x
- leftOff - rightOff - 6, pOff + 5);
gc.drawLine(pOff + leftOff + 5, pOff + size.y - 7, pOff + size.x
- leftOff - rightOff - 5, pOff + 5);
}
// 畫出恢復按鈕的圖形
private void drawRestoreImage(GC gc, Point size, int pOff) {
gc.drawRectangle(pOff + leftOff + 3, pOff + 7, size.x - leftOff
- rightOff - 11, size.y - 13);
gc.drawLine(pOff + leftOff + 4, pOff + 8, pOff + size.x - leftOff
- rightOff - 9, pOff + 8);
gc.drawLine(pOff + leftOff + 6, pOff + 5, pOff + size.x - leftOff
- rightOff - 7, pOff + 5);
gc.drawLine(pOff + leftOff + 5, pOff + 4, pOff + size.x - leftOff
- rightOff - 6, pOff + 4);
gc.drawLine(pOff + size.x - leftOff - rightOff - 7, pOff + size.y - 9,
pOff + size.x - leftOff - rightOff - 6, pOff + size.y - 9);
gc.drawLine(pOff + size.x - leftOff - rightOff - 6, pOff + size.y - 10,
pOff + size.x - leftOff - rightOff - 6, pOff + 5);
gc.drawLine(pOff + leftOff + 5, pOff + 5, pOff + leftOff + 5, pOff + 6);
}
// 畫出最大化按鈕的圖形
private void drawMaximizeImage(GC gc, Point size, int pOff) {
gc.drawRectangle(pOff + leftOff + 3, pOff + 4, size.x - leftOff
- rightOff - 8, size.y - 10);
gc.drawLine(pOff + leftOff + 4, pOff + 5, pOff + size.x - leftOff
- rightOff - 6, pOff + 5);
}
// 畫出最小化按鈕的圖形
private void drawMinimizeImage(GC gc, Point size, int pOff) {
gc.drawLine(pOff + leftOff + 4, pOff + size.y - 6, pOff + size.x
- leftOff - rightOff - 5, pOff + size.y - 6);
gc.drawLine(pOff + leftOff + 4, pOff + size.y - 7, pOff + size.x
- leftOff - rightOff - 5, pOff + size.y - 7);
}
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