JDesktopPane按内容设置的首选大小 [英] JDesktopPane preferred size set by content
本文介绍了JDesktopPane按内容设置的首选大小的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我一直试图驯服 JDesktopPane 可与可调整大小的GUI&滚动窗格，但我遇到了一些麻烦。似乎除非拖动模式是大纲，否则桌面窗格将不会按预期调整大小（当内部框架被拖到桌面窗格的边缘之外时）&因此不会产生滚动条。
I have been trying to tame JDesktopPane to work nicely with a resizable GUI & a scroll pane, but am having some troubles doing so. It seems that unless the drag mode is outline, the desktop pane will not resize as expected (when an internal frame is dragged beyond the edge of the desktop pane) & therefore not produce scroll-bars.
我在这个来源做一些非常愚蠢的事情吗？我错过了一个更好的方法吗？
Am I doing something very silly in this source? Have I missed a far better approach?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class MDIPreferredSize {
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
final JDesktopPane dt = new JDesktopPane() {
@Override
public Dimension getPreferredSize() {
Dimension prefSize = super.getPreferredSize();
System.out.println("prefSize: " + prefSize);
// inititialize the max to the first normalized bounds
Rectangle max = getAllFrames()[0].getNormalBounds();
for (JInternalFrame jif : this.getAllFrames()) {
max.add(jif.getNormalBounds());
}
System.out.println("maxBounds(): "
+ max);
int x1 = max.width + (max.x * 2) < prefSize.width
? prefSize.width
: max.width + (max.x * 2);
int y1 = max.height + (max.y * 2) < prefSize.height
? prefSize.height
: max.height + (max.y * 2);
System.out.println("x,y: "
+ x1
+ ","
+ y1);
return new Dimension(x1, y1);
}
};
dt.setAutoscrolls(true);
int xx = 5;
int yy = 5;
int vStep = 10;
int yStep = 22;
for (int ii = 0; ii < 3; ii++) {
JInternalFrame jif = new JInternalFrame(
"Internal Frame " + (ii + 1),
true,
true,
true);
dt.add(jif);
jif.setLocation(xx, yy);
xx += vStep;
yy += yStep;
jif.setSize(200, 75);
jif.setVisible(true);
}
ComponentListener componentListener = new ComponentListener() {
@Override
public void componentResized(ComponentEvent e) {
e.getComponent().validate();
}
@Override
public void componentMoved(ComponentEvent e) {
e.getComponent().validate();
}
@Override
public void componentShown(ComponentEvent e) {
e.getComponent().validate();
}
@Override
public void componentHidden(ComponentEvent e) {
// do nothing
}
};
// causes maximized internal frames to be resized..
dt.addComponentListener(componentListener);
final JCheckBox outLineDragMode = new JCheckBox("Outline Drag Mode");
ActionListener dragModeListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (outLineDragMode.isSelected()) {
dt.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
} else {
dt.setDragMode(JDesktopPane.LIVE_DRAG_MODE);
}
}
};
outLineDragMode.addActionListener(dragModeListener);
JPanel gui = new JPanel(new BorderLayout());
gui.add(outLineDragMode, BorderLayout.PAGE_START);
gui.setBorder(new EmptyBorder(2, 3, 2, 3));
gui.add(new JScrollPane(dt), BorderLayout.CENTER);
JFrame f = new JFrame("DTP Preferred");
f.add(gui);
// Ensures JVM closes after frame(s) closed and
// all non-daemon threads are finished
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
// See http://stackoverflow.com/a/7143398/418556 for demo.
f.setLocationByPlatform(true);
// ensures the frame is the minimum size it needs to be
// in order display the components within it
f.pack();
f.setMinimumSize(f.getSize());
// should be done last, to avoid flickering, moving,
// resizing artifacts.
f.setVisible(true);
printProperty("os.name");
printProperty("java.version");
printProperty("java.vendor");
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
SwingUtilities.invokeLater(r);
}
public static void printProperty(String name) {
System.out.println(name + ": \t" + System.getProperty(name));
}
}
编辑
在打印的信息中，另请参阅3个系统属性：
Edit
Amongst the information printed, see also the 3 system properties:
os.name: Windows 7
java.version: 1.7.0_21
java.vendor: Oracle Corporation
这些是这里的值。
感谢Jonathan Drapeau建议的 MouseListener ，这个固定的例子实际上使用 MouseMotionListener 来允许在拖动时要主动调整桌面窗格的大小。除了使用导致问题（尚未知道）的 MouseListener 之外，它可能会遇到一些怪癖，如果是这样，请回到在内部帧丢弃时调整桌面窗格大小的简单技巧 '（仅限 MouseListener 。）
Thanks to Jonathan Drapeau's suggestion of a MouseListener, this fixed example actually uses a MouseMotionListener to allow the desktop pane to be resized actively while dragging. It might suffer some quirks beyond use of a MouseListener that cause problems (none yet known), if so, go back to the simpler technique of 'resize desktop pane on internal frame drop' (MouseListener only).
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.plaf.basic.BasicInternalFrameTitlePane;
public class MDIPreferredSize {
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
final JDesktopPane dt = new JDesktopPane() {
@Override
public Dimension getPreferredSize() {
Dimension prefSize = super.getPreferredSize();
System.out.println("prefSize: " + prefSize);
// inititialize the max to the first normalized bounds
Rectangle max = getAllFrames()[0].getNormalBounds();
for (JInternalFrame jif : this.getAllFrames()) {
max.add(jif.getNormalBounds());
}
System.out.println("maxBounds(): "
+ max);
int x1 = max.width + (max.x * 2) < prefSize.width
? prefSize.width
: max.width + (max.x * 2);
int y1 = max.height + (max.y * 2) < prefSize.height
? prefSize.height
: max.height + (max.y * 2);
System.out.println("x,y: "
+ x1
+ ","
+ y1);
return new Dimension(x1, y1);
}
};
int xx = 5;
int yy = 5;
int vStep = 10;
int yStep = 22;
for (int ii = 0; ii < 3; ii++) {
JInternalFrame jif = new JInternalFrame(
"Internal Frame " + (ii + 1),
true,
true,
true);
dt.add(jif);
jif.setLocation(xx, yy);
xx += vStep;
yy += yStep;
jif.setSize(200, 75);
jif.setVisible(true);
}
/*final MouseListener mouseListener = new MouseAdapter() {
@Override
public void mouseReleased(MouseEvent e) {
dt.revalidate();
}
};
*/
final MouseMotionListener mouseMotionListener = new MouseMotionAdapter() {
@Override
public void mouseDragged(MouseEvent e) {
dt.revalidate();
}
};
for (JInternalFrame jif : dt.getAllFrames()) {
for (Component comp : jif.getComponents()) {
if (comp instanceof BasicInternalFrameTitlePane) {
//comp.addMouseListener(mouseListener);
comp.addMouseMotionListener(mouseMotionListener);
}
}
}
dt.setAutoscrolls(true);
final JCheckBox outLineDragMode =
new JCheckBox("Outline Drag Mode");
ActionListener dragModeListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (outLineDragMode.isSelected()) {
dt.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
} else {
dt.setDragMode(JDesktopPane.LIVE_DRAG_MODE);
}
}
};
outLineDragMode.addActionListener(dragModeListener);
JPanel gui = new JPanel(new BorderLayout());
gui.add(outLineDragMode, BorderLayout.PAGE_START);
gui.setBorder(new EmptyBorder(2, 3, 2, 3));
gui.add(new JScrollPane(dt), BorderLayout.CENTER);
JFrame f = new JFrame("DTP Preferred");
f.add(gui);
// Ensures JVM closes after frame(s) closed and
// all non-daemon threads are finished
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
// See http://stackoverflow.com/a/7143398/418556 for demo.
f.setLocationByPlatform(true);
// ensures the frame is the minimum size it needs to be
// in order display the components within it
f.pack();
f.setMinimumSize(f.getSize());
// should be done last, to avoid flickering, moving,
// resizing artifacts.
f.setVisible(true);
printProperty("os.name");
printProperty("java.version");
printProperty("java.vendor");
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
SwingUtilities.invokeLater(r);
}
public static void printProperty(String name) {
System.out.println(name + ": \t" + System.getProperty(name));
}
}
怪癖
Quirks
除了使用导致问题的
MouseListener之外，它可能会遇到一些怪癖。（/ p>
It might suffer some quirks beyond use of a
MouseListenerthat cause problems (none yet known).
那是..
- 在完全渲染模式下，只要用户拖动内部框架（甚至是GUI），桌面窗格就会动态增长。 （好。）在大纲模式下，容器只会在掉落时调整大小，而不是拖动。 （不太好，但至少滚动条可靠地出现/消失。）
推荐答案
在 JDesktopPane.LIVE_DRAG_MODE MouseListener 添加到 JInternalFrame 标题窗格c>到重新验证发布后的 JDesktopPane 是一种在每种模式下获得完全相同行为的方法。
Adding a MouseListener to the JInternalFrame title pane while in JDesktopPane.LIVE_DRAG_MODE to revalidate the JDesktopPane after release is a way to get the exact same behavior in each mode.
final MouseListener testList = new MouseListener() {
@Override
public void mouseReleased(MouseEvent e) {
dt.revalidate();
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseClicked(MouseEvent e) {
}
};
// causes maximized internal frames to be resized..
dt.addComponentListener(componentListener);
for (JInternalFrame jif : dt.getAllFrames()) {
for (Component comp : jif.getComponents()) {
if (comp instanceof BasicInternalFrameTitlePane) {
comp.addMouseListener(testList);
}
}
}
final JCheckBox outLineDragMode = new JCheckBox("Outline Drag Mode");
ActionListener dragModeListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (outLineDragMode.isSelected()) {
dt.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
for (JInternalFrame jif : dt.getAllFrames()) {
for (Component comp : jif.getComponents()) {
if (comp instanceof BasicInternalFrameTitlePane) {
comp.removeMouseListener(testList);
}
}
}
} else {
dt.setDragMode(JDesktopPane.LIVE_DRAG_MODE);
for (JInternalFrame jif : dt.getAllFrames()) {
for (Component comp : jif.getComponents()) {
if (comp instanceof BasicInternalFrameTitlePane) {
comp.addMouseListener(testList);
}
}
}
}
}
};
我在 JDesktopPane.OUTLINE_DRAG_MODE 中删除它们因为它已经做好了反应。
I remove them in the JDesktopPane.OUTLINE_DRAG_MODE since it already reacts properly.
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