?? sizegrip.java
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package org.test.custom.form;
import java.util.Timer;
import java.util.TimerTask;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
/**
* 這是非本地的尺寸控制器，它就像本地Win32的尺寸控制器。 SHADOW_IN樣式會在窗口的右下角畫幾道斜線。
* 該控件是否可見由窗口是否最大化決定。如果窗口是最大的，不論是否使用了setVisible(true)方法，它都將被隱。
*
*/
public final class SizeGrip extends Canvas {
private static final int WIDTH = 13;
private static final int HEIGHT = 13;
private static final long UPDATE_DELAY = 25;
private int mouseDownOffsetX, mouseDownOffsetY, snapBackX, snapBackY;
private boolean cancelled;
private Cursor sizeCursor;
private Point minSize;
private boolean userVisible = true;
private volatile long lastUpdate;
private Timer timer = new Timer(true);
private TimerTask timerTask;
private Composite resizableParent;
public SizeGrip(Composite parent, int style) {
this(parent, parent.getShell(), style);
}
public SizeGrip(Composite parent, final Composite resizableParent, int style) {
super(parent, style = checkStyle(style));
this.resizableParent = resizableParent;
setSize(WIDTH, HEIGHT);
sizeCursor = new Cursor(getDisplay(), SWT.CURSOR_SIZENWSE);
setCursor(sizeCursor);
// 為控件注冊各種事件偵聽器
addListener(SWT.Dispose, new Listener() {
public void handleEvent(Event e) {
if (sizeCursor != null) {
sizeCursor.dispose();
sizeCursor = null;
}
}
});
addListener(SWT.Paint, new Listener() {
public void handleEvent(Event event) {
Rectangle r = getClientArea();
if (r.width == 0 || r.height == 0)
return;
Display disp = getDisplay();
Color shadow = disp
.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
Color highlight = disp
.getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW);
event.gc.setLineWidth(1);
// 根據控件創建時的樣式畫出不同的圖形
if ((getStyle() & SWT.FLAT) != 0) {
event.gc.setBackground(highlight);
event.gc.fillRectangle(r.width - 3, r.height - 3, 2, 2);
event.gc.fillRectangle(r.width - 7, r.height - 3, 2, 2);
event.gc.fillRectangle(r.width - 11, r.height - 3, 2, 2);
event.gc.fillRectangle(r.width - 3, r.height - 7, 2, 2);
event.gc.fillRectangle(r.width - 7, r.height - 7, 2, 2);
event.gc.fillRectangle(r.width - 3, r.height - 11, 2, 2);
event.gc.setBackground(shadow);
event.gc.fillRectangle(r.width - 4, r.height - 4, 2, 2);
event.gc.fillRectangle(r.width - 8, r.height - 4, 2, 2);
event.gc.fillRectangle(r.width - 12, r.height - 4, 2, 2);
event.gc.fillRectangle(r.width - 4, r.height - 8, 2, 2);
event.gc.fillRectangle(r.width - 8, r.height - 8, 2, 2);
event.gc.fillRectangle(r.width - 4, r.height - 12, 2, 2);
event.gc.setForeground(highlight);
} else {
event.gc.setForeground(shadow);
event.gc.drawLine(r.width - 3, r.height - 2, r.width - 2,
r.height - 3);
event.gc.drawLine(r.width - 4, r.height - 2, r.width - 2,
r.height - 4);
event.gc.drawLine(r.width - 7, r.height - 2, r.width - 2,
r.height - 7);
event.gc.drawLine(r.width - 8, r.height - 2, r.width - 2,
r.height - 8);
event.gc.drawLine(r.width - 11, r.height - 2, r.width - 2,
r.height - 11);
event.gc.drawLine(r.width - 12, r.height - 2, r.width - 2,
r.height - 12);
event.gc.setForeground(highlight);
event.gc.drawLine(r.width - 5, r.height - 2, r.width - 2,
r.height - 5);
event.gc.drawLine(r.width - 9, r.height - 2, r.width - 2,
r.height - 9);
event.gc.drawLine(r.width - 13, r.height - 2, r.width - 2,
r.height - 13);
}
if ((getStyle() & SWT.SHADOW_IN) != 0) {
if (event.width > WIDTH)
event.gc.drawLine(0, r.height - 1, r.width - 14,
r.height - 1);
if (event.height > HEIGHT)
event.gc.drawLine(r.width - 1, 0, r.width - 1,
r.height - 14);
}
}
});
addListener(SWT.MouseDown, new Listener() {
public void handleEvent(Event event) {
if (event.button == 1) {
mouseDownOffsetX = event.x;
mouseDownOffsetY = event.y;
Point p = resizableParent.getSize();
snapBackX = p.x;
snapBackY = p.y;
cancelled = false;
//System.out.println("x="+mouseDownOffsetX+",
// y="+mouseDownOffsetY);
} else if (event.button == 3
&& (event.stateMask & SWT.BUTTON1) != 0) // chord click
{
if (snapBackX > 0 && snapBackY > 0) {
resizableParent.setSize(snapBackX, snapBackY);
snapBackX = 0;
snapBackY = 0;
cancelled = true;
}
}
}
});
addListener(SWT.MouseMove, new Listener() {
public void handleEvent(final Event event) {
if (!cancelled && (event.stateMask & SWT.BUTTON1) != 0) {
if (timerTask != null) {
timerTask.cancel();
timerTask = null;
}
long now = System.currentTimeMillis();
if (lastUpdate + UPDATE_DELAY < now) {
performResize(event);
lastUpdate = now;
} else {
timerTask = new TimerTask() {
public void run() {
final TimerTask executingTask = this;
event.display.asyncExec(new Runnable() {
public void run() {
if (executingTask != timerTask)
return;
performResize(event);
}
});
}
};
timer.schedule(timerTask, UPDATE_DELAY);
}
}
}
});
addListener(SWT.MouseUp, new Listener() {
public void handleEvent(Event event) {
if (timerTask != null) {
timerTask.cancel();
timerTask = null;
}
if (!cancelled && (event.stateMask & SWT.BUTTON1) != 0) {
performResize(event);
}
}
});
// 注冊改變窗口大小的事件偵聽器
final Listener resizeListener = (resizableParent instanceof Shell) ? new Listener() {
public void handleEvent(Event event) {
updateVisibility();
}
}
: null;
if (resizeListener != null)
resizableParent.addListener(SWT.Resize, resizeListener);
addListener(SWT.Dispose, new Listener() {
public void handleEvent(Event event) {
timer.cancel();
if (resizeListener != null)
resizableParent.removeListener(SWT.Resize, resizeListener);
}
});
updateVisibility();
}
private void performResize(Event event) {
// 首先確定是否處在窗口內
Rectangle ca;
if (resizableParent instanceof Shell)
ca = getDisplay().getClientArea();
else
ca = getDisplay().map(resizableParent.getParent(), null,
resizableParent.getParent().getClientArea());
Point limit = toControl(ca.x + ca.width - 1, ca.y + ca.height - 1);
event.x = Math.min(event.x, limit.x);
event.y = Math.min(event.y, limit.y);
Point p = resizableParent.getSize();
int newX = p.x + event.x - mouseDownOffsetX;
int newY = p.y + event.y - mouseDownOffsetY;
if (minSize != null) {
newX = Math.max(minSize.x, newX);
newY = Math.max(minSize.y, newY);
}
if (newX != p.x || newY != p.y)
resizableParent.setSize(newX, newY);
}
// 根據窗口是否最大化，設置控件的可見性
private void updateVisibility() {
if (resizableParent instanceof Shell) {
boolean vis = super.getVisible();
boolean max = ((Shell) resizableParent).getMaximized();
boolean newVis = userVisible && !max;
if (vis != newVis)
super.setVisible(newVis);
} else if (userVisible != super.getVisible())
super.setVisible(userVisible);
}
public Point computeSize(int wHint, int hHint, boolean changed) {
checkWidget();
if (wHint == SWT.DEFAULT)
wHint = WIDTH;
if (hHint == SWT.DEFAULT)
hHint = HEIGHT;
return new Point(wHint, hHint);
}
private static int checkStyle(int style) {
int mask = SWT.SHADOW_IN | SWT.FLAT;
style &= mask;
return style;
}
public boolean setFocus() {
checkWidget();
return false;
}
public boolean isReparentable() {
checkWidget();
return false;
}
// 設置窗口最小允許的尺寸
public void setMinimumShellSize(Point p) {
checkWidget();
this.minSize = p;
}
public void setMinimumShellSize(int width, int height) {
checkWidget();
this.minSize = new Point(width, height);
}
public boolean getVisible() {
checkWidget();
return userVisible;
}
public void setVisible(boolean visible) {
checkWidget();
userVisible = visible;
updateVisibility();
}
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