Important：該類有諸多不盡人意的地方，讀者如果要用，請自行完善，但是至少值得一試。
原代碼是一個老外寫的在桌面右下角彈出消息提示的一個類，我進行了改寫。
任何改進，希望你能不吝分享。
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Scrollable;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.wb.swt.SWTResourceManager;
/**
* 具有淡入淡出效果且不需要用戶點擊關閉的消息提示框。
* @author ggfan@amarsoft
*
*/
public class Notifier {
private static final int DISPLAY_TIME = 2000;
private static final int FADE_TIMER = 50;
private static final int FADE_IN_STEP = 30;
private static final int FADE_OUT_STEP = 8;
private static final int FINAL_ALPHA = 225;
public static int DEFAULT_WIDTH = 150;
public static int DEFAULT_HEIGHT = 60;
private static Color _titleFgColor = SWTResourceManager.getColor(40, 73, 97);
private static Color _fgColor = _titleFgColor;
private static Color _bgFgGradient = SWTResourceManager.getColor(226, 239, 249);
private static Color _bgBgGradient = SWTResourceManager.getColor(177, 211, 243);
private static Color _borderColor = SWTResourceManager.getColor(40, 73, 97);
private static Image _oldImage;
// TODO Scrollable可能不合適
public static void notify(Scrollable scrollable, final String msg) {
final Shell parentShell = scrollable.getShell();
final Shell newShell = new Shell(parentShell, SWT.NO_FOCUS | SWT.NO_TRIM);
newShell.setLayout(new FillLayout());
newShell.setForeground(_fgColor);
newShell.setBackground(_bgBgGradient);
newShell.setBackgroundMode(SWT.INHERIT_FORCE);
scrollable.addDisposeListener(new DisposeListener(){ public void widgetDisposed(DisposeEvent e) {
newShell.dispose();
}
});
FillLayout layout = new FillLayout();
layout.marginWidth = 20;
layout.marginHeight = 20;
inner.setLayout(layout);
newShell.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event event) {
try {
Rectangle rect = newShell.getClientArea();
Image newImage = new Image(Display.getDefault(), Math.max(1, rect.width), rect.height);
GC gc = new GC(newImage);
// 背景
gc.setForeground(_bgFgGradient);
gc.setBackground(_bgBgGradient);
gc.fillGradientRectangle(rect.x, rect.y, rect.width, rect.height, true);
// 邊框
gc.setLineWidth(2);
gc.setForeground(_borderColor);
gc.drawRectangle(rect.x + 1, rect.y + 1, rect.width - 2, rect.height - 2);
gc.dispose();
newShell.setBackgroundImage(newImage);
if (_oldImage != null) {
_oldImage.dispose();
}
_oldImage = newImage;
} catch (Exception err) {
err.printStackTrace();
}
}
});
Label text = new Label(inner, SWT.WRAP | SWT.CENTER);
Font tf = text.getFont();
FontData tfd = tf.getFontData()[0];
tfd.setStyle(SWT.BOLD);
tfd.height = 8;
text.setFont(SWTResourceManager.getFont(tfd.getName(), 8, SWT.NORMAL));
text.setForeground(_fgColor);
text.setText(msg);
newShell.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
if (Display.getDefault().getActiveShell() == null || Display.getDefault().getActiveShell().getMonitor() == null) {
return;
}
newShell.setLocation(computePoint(scrollable));
newShell.setAlpha(0);
newShell.setVisible(true);
fadeIn(newShell);
}
// TODO 當有滾動條出現的時候是否能夠居中？
private static Point computePoint(Scrollable scrollable) {
Point p = scrollable.toDisplay(scrollable.getClientArea().x, scrollable.getClientArea().y);
int w = scrollable.getClientArea().width;
int h = scrollable.getClientArea().height;
p.x += w / 2 - DEFAULT_WIDTH / 2 ;
p.y += h / 2 - DEFAULT_HEIGHT / 2;
return p;
}
private static void fadeIn(final Shell _shell) {
Runnable run = new Runnable() {
@Override
public void run() {
try {
if (_shell == null || _shell.isDisposed()) {
return;
}
int cur = _shell.getAlpha();
cur += FADE_IN_STEP;
if (cur > FINAL_ALPHA) {
_shell.setAlpha(FINAL_ALPHA);
startTimer(_shell);
return;
}
_shell.setAlpha(cur);
Display.getDefault().timerExec(FADE_TIMER, this);
} catch (Exception err) {
err.printStackTrace();
}
}
};
Display.getDefault().timerExec(FADE_TIMER, run);
}
private static void startTimer(final Shell _shell) {
Runnable run = new Runnable() {
@Override
public void run() {
try {
if (_shell == null || _shell.isDisposed()) {
return;
}
fadeOut(_shell);
} catch (Exception err) {
err.printStackTrace();
}
}
};
Display.getDefault().timerExec(DISPLAY_TIME, run);
}
private static void fadeOut(final Shell _shell) {
final Runnable run = new Runnable() {
@Override
public void run() {
try {
if (_shell == null || _shell.isDisposed()) {
return;
}
int cur = _shell.getAlpha();
cur -= FADE_OUT_STEP;
if (cur <= 0) {
_shell.setAlpha(0);
if (_oldImage != null) {
_oldImage.dispose();
}
_shell.dispose();
return;
}
_shell.setAlpha(cur);
Display.getDefault().timerExec(FADE_TIMER, this);
} catch (Exception err) {
err.printStackTrace();
}
}
};
Display.getDefault().timerExec(FADE_TIMER, run);
}
}
posted on 2011-10-12 10:48
West Farmer 閱讀(3271)
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Eclipse-RCP