我一直在努力驯服
JDesktopPane,使用可调整大小的GUI&滚动窗格,但有一些麻烦这样做.看起来除非拖动模式是轮廓,否则桌面窗格将不会像预期那样调整大小(当内部框架被拖动到桌面窗格的边缘之外时)因此不会产生滚动条.
我在这方面做的事情很傻吗？我错过了更好的方法吗？
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);
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 https://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,还可以看到3个系统属性：
os.name: Windows 7 java.version: 1.7.0_21 java.vendor: Oracle Corporation
这些是这里的价值观.
MouseMotionListener固定代码
感谢Jonathan Drapeau对MouseListener的建议,这个固定的例子实际上使用了一个MouseMotionListener来允许在拖动时主动调整桌面窗格.除了使用引起问题的MouseListener(还没有知道)之外,它可能会受到一些怪癖,如果是这样,可以回到“内部帧丢弃”(“MouseListener only”)上“调整桌面窗格大小”的简单技术.
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,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),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,// 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
It might suffer some quirks beyond use of a
MouseListenerthat cause problems (none yet known).
那就是..
>在完全呈现模式下,只要用户拖动内部框架(甚至GUI),桌面窗格将动态增长. (好.)在轮廓模式下,容器只能调整大小,而不是拖动. (不太好,但至少滚动条出现/消失可靠.)
解决方法
在JDesktopPane.LIVE_DRAG_MODE中,在JInternalFrame标题窗格中添加一个MouseListener,以便在发布后重新验证JDesktopPane是一种在每种模式下获得完全相同的行为的方式.
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,因为它已经正确响应了.
