Java SWT - 可调整大小 shell 并具有自定义形状
Java SWT - Resizable shell with custom shape
我有一个应用程序，您可以在其中召唤带有控件的小 windows。我希望这些 windows 是带圆角的矩形，没有任何装饰。我发现了这个老问题并使用了它：
SWT Shell with round corners.
我最终得到了这个：
package swt_window_test;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Region;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class SingleDisplayMultipleShells
{
// circle
static int[] circle(int r, int offsetX, int offsetY) {
int[] polygon = new int[8 * r + 4];
// x^2 + y^2 = r^2
for (int i = 0; i < 2 * r + 1; i++) {
int x = i - r;
int y = (int) Math.sqrt(r * r - x * x);
polygon[2 * i] = offsetX + x;
polygon[2 * i + 1] = offsetY + y;
polygon[8 * r - 2 * i - 2] = offsetX + x;
polygon[8 * r - 2 * i - 1] = offsetY - y;
}
return polygon;
}
// ========================================
// Inner class to represent a child Shell
// ========================================
private class ChildShell
{
public ChildShell(Shell mainWindowShell)
{
System.out.println("Creating new child Shell");
Display display = mainWindowShell.getDisplay();
// =========================================
// Create a Shell (window) from the Display
// =========================================
final Shell shell = new Shell(mainWindowShell, SWT.NO_TRIM | SWT.ON_TOP);
shell.setBackground(display.getSystemColor(SWT.COLOR_RED));
// define a region that looks like a key hole
Region region = new Region();
region.add(circle(10, 10, 10));
region.add(circle(10, 10, 500));
region.add(circle(10, 500, 10));
region.add(circle(10, 500, 500));
region.add(new int[] { 10, 0, 10, 510, 500, 510, 500, 0 });
region.add(new int[] { 0, 10, 0, 500, 510, 500, 510, 10 });
// define the shape of the shell using setRegion
shell.setRegion(region);
Rectangle size = region.getBounds();
shell.setSize(size.width, size.height);
// add ability to move shell around
Listener l = new Listener() {
Point origin;
public void handleEvent(Event e) {
switch (e.type) {
case SWT.MouseDown:
origin = new Point(e.x, e.y);
break;
case SWT.MouseUp:
origin = null;
break;
case SWT.MouseMove:
if (origin != null) {
Point p = display.map(shell, null, e.x, e.y);
shell.setLocation(p.x - origin.x, p.y - origin.y);
}
break;
}
}
};
shell.addListener(SWT.MouseDown, l);
shell.addListener(SWT.MouseUp, l);
shell.addListener(SWT.MouseMove, l);
// add ability to close shell
Button b = new Button(shell, SWT.PUSH);
b.setBackground(shell.getBackground());
b.setText("close");
b.pack();
b.setLocation(10, 68);
b.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
shell.close();
}
});
shell.open();
// =============================================================
// Register a listener for the Close event on the child Shell.
// This disposes the child Shell
// =============================================================
shell.addListener(SWT.Close, new Listener()
{
@Override
public void handleEvent(Event event)
{
System.out.println("Child Shell handling Close event, about to dispose this Shell");
shell.dispose();
}
});
}
}
public SingleDisplayMultipleShells()
{
// ======================================================
// Create the main Display object that represents the UI
// subsystem and contains the single UI handling thread
// ======================================================
final Display display = Display.getDefault();
// ====================================================
// create a shell for the main window from the Display
// ====================================================
final Shell mainWindowShell = new Shell(display, SWT.CLOSE);
// =====================
// Set the Window Title
// =====================
mainWindowShell.setText("Main Shell");
// =========================================
// Create a button that spawns child Shells
// =========================================
Button spawn = new Button(mainWindowShell, SWT.PUSH);
spawn.setText("Create Child");
spawn.setBounds(10, 10, 150, 30);
spawn.addSelectionListener(new SelectionListener()
{
@Override
public void widgetSelected(SelectionEvent e)
{
// =====================================================
// on button press, create a child Shell object passing
// the main Display. The child could also access the
// display itself by calling Display.getDefault()
// =====================================================
System.out.println("Main Shell handling Button press, about to create child Shell");
new ChildShell(mainWindowShell);
}
@Override
public void widgetDefaultSelected(SelectionEvent e)
{
widgetSelected(e);
}
});
// =============================================================
// Register a listener for the Close event on the main Shell.
// This disposes the Display which will cause the entire child
// tree to dispose
// =============================================================
mainWindowShell.addListener(SWT.Close, new Listener()
{
@Override
public void handleEvent(Event event)
{
System.out.println("Main Shell handling Close event, about to dipose the main Display");
display.dispose();
}
});
// ================================
// Set size on main Shell and open
// ================================
mainWindowShell.setSize(200, 200);
mainWindowShell.open();
// =====================================
// Main UI event dispatch loop
// that handles all UI events from all
// SWT components created as children of
// the main Display object
// =====================================
while (!display.isDisposed())
{
// ===================================================
// Wrap each event dispatch in an exception handler
// so that if any event causes an exception it does
// not break the main UI loop
// ===================================================
try
{
if (!display.readAndDispatch())
{
display.sleep();
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
System.out.println("Main Display event handler loop has exited");
}
public static void main(String[] args)
{
new SingleDisplayMultipleShells();
}
}
我对结果很满意，但我想知道是否有办法让这些 windows 可调整大小？
正如 greg 在评论中所说，我想做的是需要使用 SWT.RESIZE，它与 SWT.NO_TRIM 不兼容，没有第二个我就无法自定义形状一.
所以我所做的就是添加一个按钮来改变 shell:
的形状
Button resize = new Button(shell, SWT.PUSH);
resize.setText("Resize");
resize.setBounds(140, 430, 20, 20);
resize.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
if (!isMaximized) {
Region region = new Region();
region.add(circle(20, 20, 20));
region.add(circle(20, 20, 580));
region.add(circle(20, 280, 20));
region.add(circle(20, 280, 580));
region.add(new int[] { 20, 0, 280, 0, 280, 600, 20, 600 });
region.add(new int[] { 0, 20, 300, 20, 300, 580, 0, 580 });
shell.setRegion(region);
Rectangle size = region.getBounds();
shell.setSize(size.width, size.height);
resize.setBounds(140, 580, 20, 20);
isMaximized = true;
}else {
Region region = new Region();
region.add(circle(20, 20, 20));
region.add(circle(20, 20, 430));
region.add(circle(20, 280, 20));
region.add(circle(20, 280, 430));
region.add(new int[] { 20, 0, 280, 0, 280, 450, 20, 450 });
region.add(new int[] { 0, 20, 300, 20, 300, 430, 0, 430 });
shell.setRegion(region);
Rectangle size = region.getBounds();
shell.setSize(size.width, size.height);
resize.setBounds(140, 430, 20, 20);
isMaximized = false;
}
}
});
isMaximized 是一个布尔值，用于了解 shell 是否处于 "big" 形状。
这将可能的大小限制为两个，但对我来说已经足够了。
我有一个应用程序，您可以在其中召唤带有控件的小 windows。我希望这些 windows 是带圆角的矩形，没有任何装饰。我发现了这个老问题并使用了它： SWT Shell with round corners.
我最终得到了这个：
package swt_window_test;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Region;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class SingleDisplayMultipleShells
{
// circle
static int[] circle(int r, int offsetX, int offsetY) {
int[] polygon = new int[8 * r + 4];
// x^2 + y^2 = r^2
for (int i = 0; i < 2 * r + 1; i++) {
int x = i - r;
int y = (int) Math.sqrt(r * r - x * x);
polygon[2 * i] = offsetX + x;
polygon[2 * i + 1] = offsetY + y;
polygon[8 * r - 2 * i - 2] = offsetX + x;
polygon[8 * r - 2 * i - 1] = offsetY - y;
}
return polygon;
}
// ========================================
// Inner class to represent a child Shell
// ========================================
private class ChildShell
{
public ChildShell(Shell mainWindowShell)
{
System.out.println("Creating new child Shell");
Display display = mainWindowShell.getDisplay();
// =========================================
// Create a Shell (window) from the Display
// =========================================
final Shell shell = new Shell(mainWindowShell, SWT.NO_TRIM | SWT.ON_TOP);
shell.setBackground(display.getSystemColor(SWT.COLOR_RED));
// define a region that looks like a key hole
Region region = new Region();
region.add(circle(10, 10, 10));
region.add(circle(10, 10, 500));
region.add(circle(10, 500, 10));
region.add(circle(10, 500, 500));
region.add(new int[] { 10, 0, 10, 510, 500, 510, 500, 0 });
region.add(new int[] { 0, 10, 0, 500, 510, 500, 510, 10 });
// define the shape of the shell using setRegion
shell.setRegion(region);
Rectangle size = region.getBounds();
shell.setSize(size.width, size.height);
// add ability to move shell around
Listener l = new Listener() {
Point origin;
public void handleEvent(Event e) {
switch (e.type) {
case SWT.MouseDown:
origin = new Point(e.x, e.y);
break;
case SWT.MouseUp:
origin = null;
break;
case SWT.MouseMove:
if (origin != null) {
Point p = display.map(shell, null, e.x, e.y);
shell.setLocation(p.x - origin.x, p.y - origin.y);
}
break;
}
}
};
shell.addListener(SWT.MouseDown, l);
shell.addListener(SWT.MouseUp, l);
shell.addListener(SWT.MouseMove, l);
// add ability to close shell
Button b = new Button(shell, SWT.PUSH);
b.setBackground(shell.getBackground());
b.setText("close");
b.pack();
b.setLocation(10, 68);
b.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
shell.close();
}
});
shell.open();
// =============================================================
// Register a listener for the Close event on the child Shell.
// This disposes the child Shell
// =============================================================
shell.addListener(SWT.Close, new Listener()
{
@Override
public void handleEvent(Event event)
{
System.out.println("Child Shell handling Close event, about to dispose this Shell");
shell.dispose();
}
});
}
}
public SingleDisplayMultipleShells()
{
// ======================================================
// Create the main Display object that represents the UI
// subsystem and contains the single UI handling thread
// ======================================================
final Display display = Display.getDefault();
// ====================================================
// create a shell for the main window from the Display
// ====================================================
final Shell mainWindowShell = new Shell(display, SWT.CLOSE);
// =====================
// Set the Window Title
// =====================
mainWindowShell.setText("Main Shell");
// =========================================
// Create a button that spawns child Shells
// =========================================
Button spawn = new Button(mainWindowShell, SWT.PUSH);
spawn.setText("Create Child");
spawn.setBounds(10, 10, 150, 30);
spawn.addSelectionListener(new SelectionListener()
{
@Override
public void widgetSelected(SelectionEvent e)
{
// =====================================================
// on button press, create a child Shell object passing
// the main Display. The child could also access the
// display itself by calling Display.getDefault()
// =====================================================
System.out.println("Main Shell handling Button press, about to create child Shell");
new ChildShell(mainWindowShell);
}
@Override
public void widgetDefaultSelected(SelectionEvent e)
{
widgetSelected(e);
}
});
// =============================================================
// Register a listener for the Close event on the main Shell.
// This disposes the Display which will cause the entire child
// tree to dispose
// =============================================================
mainWindowShell.addListener(SWT.Close, new Listener()
{
@Override
public void handleEvent(Event event)
{
System.out.println("Main Shell handling Close event, about to dipose the main Display");
display.dispose();
}
});
// ================================
// Set size on main Shell and open
// ================================
mainWindowShell.setSize(200, 200);
mainWindowShell.open();
// =====================================
// Main UI event dispatch loop
// that handles all UI events from all
// SWT components created as children of
// the main Display object
// =====================================
while (!display.isDisposed())
{
// ===================================================
// Wrap each event dispatch in an exception handler
// so that if any event causes an exception it does
// not break the main UI loop
// ===================================================
try
{
if (!display.readAndDispatch())
{
display.sleep();
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
System.out.println("Main Display event handler loop has exited");
}
public static void main(String[] args)
{
new SingleDisplayMultipleShells();
}
}
我对结果很满意，但我想知道是否有办法让这些 windows 可调整大小？
正如 greg 在评论中所说，我想做的是需要使用 SWT.RESIZE，它与 SWT.NO_TRIM 不兼容，没有第二个我就无法自定义形状一.
所以我所做的就是添加一个按钮来改变 shell:
的形状Button resize = new Button(shell, SWT.PUSH);
resize.setText("Resize");
resize.setBounds(140, 430, 20, 20);
resize.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
if (!isMaximized) {
Region region = new Region();
region.add(circle(20, 20, 20));
region.add(circle(20, 20, 580));
region.add(circle(20, 280, 20));
region.add(circle(20, 280, 580));
region.add(new int[] { 20, 0, 280, 0, 280, 600, 20, 600 });
region.add(new int[] { 0, 20, 300, 20, 300, 580, 0, 580 });
shell.setRegion(region);
Rectangle size = region.getBounds();
shell.setSize(size.width, size.height);
resize.setBounds(140, 580, 20, 20);
isMaximized = true;
}else {
Region region = new Region();
region.add(circle(20, 20, 20));
region.add(circle(20, 20, 430));
region.add(circle(20, 280, 20));
region.add(circle(20, 280, 430));
region.add(new int[] { 20, 0, 280, 0, 280, 450, 20, 450 });
region.add(new int[] { 0, 20, 300, 20, 300, 430, 0, 430 });
shell.setRegion(region);
Rectangle size = region.getBounds();
shell.setSize(size.width, size.height);
resize.setBounds(140, 430, 20, 20);
isMaximized = false;
}
}
});
isMaximized 是一个布尔值，用于了解 shell 是否处于 "big" 形状。
这将可能的大小限制为两个，但对我来说已经足够了。