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POWhy does this JDialog flicker in Win7 when modal?
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<p>In Windows 7, and Java 1.7 (or if 1.6, comment-out the two lines indicated), create a NetBeans/Eclipse project named "test" with two classes, Test and DroppableFrame, and paste this code into it. And then run it.</p> <p>If you run with modal = true, it flickers. If you run with modal = false, it doesn't. What am I doing wrong?</p> <pre><code>// test.java package test; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.Font; import java.awt.Insets; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JLayeredPane; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JTextField; public class Test implements KeyListener, MouseListener { public Test(boolean m_modal) { Dimension prefSize; Insets inset; Font fontLabel, fontInput, fontButtons; int buttonCenters, buttonBackoff, buttonWidth, buttonCount, thisButton, buttonTop; String caption; JLayeredPane m_pane; JLabel m_lblBackground; JScrollPane m_txtInputScroll; int m_width, m_height, m_actual_width, m_actual_height; boolean m_singleLineInput = true; String m_caption = "Sample Modal Input"; m_width = 450; m_height = m_singleLineInput ? /*single line*/180 : /*multi-line*/250; m_frame = new DroppableFrame(false); caption = m_caption; m_frame.setTitle(caption); // Compute the actual size we need for our window, so it's properly centered m_frame.pack(); Insets fi = m_frame.getInsets(); m_actual_width = m_width + fi.left + fi.right; m_actual_height = m_height + fi.top + fi.bottom; m_frame.setSize(m_width + fi.left + fi.right, m_height + fi.top + fi.bottom); prefSize = new Dimension(m_width + fi.left + fi.right, m_height + fi.top + fi.bottom); m_frame.setMinimumSize(prefSize); m_frame.setPreferredSize(prefSize); m_frame.setMinimumSize(prefSize); m_frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); m_frame.setSize(m_width, m_height); m_frame.setLocationRelativeTo(null); // Center window m_frame.setLayout(null); // We handle all redraws Container c = m_frame.getContentPane(); c.setBackground(Color.WHITE); c.setForeground(Color.BLACK); m_pane = new JLayeredPane(); m_pane.setLayout(null); m_pane.setBounds(0, 0, m_width, m_height); m_pane.setVisible(true); m_pane.setBorder(BorderFactory.createEmptyBorder()); c.add(m_pane); // Set the background image m_lblBackground = new JLabel(); m_lblBackground.setBounds(0, 0, m_width, m_height); m_lblBackground.setHorizontalAlignment(JLabel.LEFT); m_lblBackground.setVerticalAlignment(JLabel.TOP); m_lblBackground.setVisible(true); m_lblBackground.setBackground(Color.WHITE); m_pane.add(m_lblBackground); m_pane.moveToFront(m_lblBackground); // Create the fonts fontLabel = new Font("Calibri", Font.BOLD, 20); fontInput = new Font("Calibri", Font.BOLD, 14); fontButtons = fontLabel; // Create the visible label contents JLabel m_lblLabel = new JLabel(); m_lblLabel.setBounds(15, 52, 423, 28); m_lblLabel.setHorizontalAlignment(JLabel.LEFT); m_lblLabel.setVerticalAlignment(JLabel.CENTER); m_lblLabel.setFont(fontLabel); m_lblLabel.setForeground(Color.BLUE); m_lblLabel.setText("A sample input:"); m_lblLabel.setVisible(true); m_pane.add(m_lblLabel); m_pane.moveToFront(m_lblLabel); // Create the input box if (m_singleLineInput) { // It's a single-line input box m_txtInputSingleLine = new JTextField(); m_txtInputSingleLine.setBounds(15, 85, 421, 25); m_txtInputSingleLine.setFont(fontInput); m_txtInputSingleLine.setText("Initial Value"); m_txtInputSingleLine.setVisible(true); m_txtInputSingleLine.addKeyListener(this); m_pane.add(m_txtInputSingleLine); m_pane.moveToFront(m_txtInputSingleLine); } else { m_txtInput = new JTextArea(); m_txtInputScroll = new JScrollPane(m_txtInput); m_txtInputScroll.setBounds(15, 83, 421, 100); m_txtInputScroll.setAutoscrolls(true); m_txtInputScroll.setVisible(true); m_txtInput.setFont(fontInput); m_txtInput.setLineWrap(true); m_txtInput.setWrapStyleWord(true); m_txtInput.setTabSize(2); m_txtInput.setText("Initial Value"); m_txtInput.setVisible(true); m_pane.add(m_txtInputScroll); m_pane.moveToFront(m_txtInputScroll); } // Determine which buttons are specified buttonCount = 0; m_buttons = _CANCEL_BUTTON + _OKAY_BUTTON; if ((m_buttons & _NEXT_BUTTON) != 0) { m_btnNext = new JButton("Next"); m_btnNext.setFont(fontButtons); m_btnNext.addMouseListener(this); inset = m_btnNext.getInsets(); inset.left = 3; inset.right = 3; m_btnNext.setMargin(inset); m_pane.add(m_btnNext); m_pane.moveToFront(m_btnNext); ++buttonCount; } if ((m_buttons & _CANCEL_BUTTON) != 0) { m_btnCancel = new JButton("Cancel"); m_btnCancel.setFont(fontButtons); m_btnCancel.addMouseListener(this); inset = m_btnCancel.getInsets(); inset.left = 3; inset.right = 3; m_btnCancel.setMargin(inset); m_pane.add(m_btnCancel); m_pane.moveToFront(m_btnCancel); ++buttonCount; } if ((m_buttons & _ACCEPT_BUTTON) != 0) { m_btnAccept = new JButton("Accept"); m_btnAccept.setFont(fontButtons); m_btnAccept.addMouseListener(this); inset = m_btnAccept.getInsets(); inset.left = 3; inset.right = 3; m_btnAccept.setMargin(inset); m_pane.add(m_btnAccept); m_pane.moveToFront(m_btnAccept); ++buttonCount; } if ((m_buttons & _OKAY_BUTTON) != 0) { m_btnOkay = new JButton("Okay"); m_btnOkay.setFont(fontButtons); m_btnOkay.addMouseListener(this); inset = m_btnOkay.getInsets(); inset.left = 3; inset.right = 3; m_btnOkay.setMargin(inset); m_pane.add(m_btnOkay); m_pane.moveToFront(m_btnOkay); ++buttonCount; } // Determine the coordinates for each button buttonCenters = (m_width / (buttonCount + 1)); buttonWidth = (int)((double)buttonCenters * 0.80); buttonBackoff = (m_width / (buttonCount + 2)) / 2; // Position the buttons thisButton = 1; buttonTop = m_singleLineInput ? 130 : 200; if (m_btnNext != null) { // Position and make visible this button m_btnNext.setBounds( + (thisButton * buttonCenters) - buttonBackoff, buttonTop, buttonWidth, 40); m_btnNext.setVisible(true); ++thisButton; } if (m_btnCancel != null) { // Position and make visible this button m_btnCancel.setBounds((thisButton * buttonCenters) - buttonBackoff, buttonTop, buttonWidth, 40); m_btnCancel.setVisible(true); ++thisButton; } if (m_btnAccept!= null) { // Position and make visible this button m_btnAccept.setBounds((thisButton * buttonCenters) - buttonBackoff, buttonTop, buttonWidth, 40); m_btnAccept.setVisible(true); ++thisButton; } if (m_btnOkay != null) { // Position and make visible this button m_btnOkay.setBounds((thisButton * buttonCenters) - buttonBackoff, buttonTop, buttonWidth, 40); m_btnOkay.setVisible(true); ++thisButton; } // The modal code causes some slow component rendering. // Needs looked at to figure out why if (m_modal) { // Make it a modal window m_frame.setModal(m_width, m_height, fi, m_pane); } else { // Make it a non-modal window m_frame.setVisible(true); m_frame.forceWindowToHaveFocus(); } } @Override public void keyTyped(KeyEvent e) { } @Override public void keyPressed(KeyEvent e) { } @Override public void keyReleased(KeyEvent e) { } @Override public void mouseClicked(MouseEvent e) { m_frame.dispose(); System.exit(0); } @Override public void mousePressed(MouseEvent e) { } @Override public void mouseReleased(MouseEvent e) { } @Override public void mouseEntered(MouseEvent e) { } @Override public void mouseExited(MouseEvent e) { } public static void main(String[] args) { boolean modal = true; Test t = new Test(modal); } private DroppableFrame m_frame; private int m_buttons; private JTextField m_txtInputSingleLine; private JTextArea m_txtInput; private JButton m_btnNext; private JButton m_btnCancel; private JButton m_btnAccept; private JButton m_btnOkay; public static final int _NEXT_BUTTON = 1; public static final int _CANCEL_BUTTON = 2; public static final int _ACCEPT_BUTTON = 4; public static final int _OKAY_BUTTON = 8; public static final int _NEXT_CANCEL = 3; public static final int _ACCEPT_CANCEL = 6; public static final int _OKAY_CANCEL = 10; } // DroppableFrame.java package test; import java.awt.*; import java.awt.event.ComponentEvent; import java.io.*; import java.util.*; import java.awt.dnd.*; import java.awt.datatransfer.*; import java.awt.event.ComponentListener; import java.awt.event.InputEvent; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import javax.swing.*; public class DroppableFrame extends JFrame implements DropTargetListener, DragSourceListener, DragGestureListener, ComponentListener { public DroppableFrame(boolean isResizeable) { super("JFrame"); m_dragSource = DragSource.getDefaultDragSource(); m_dragSource.createDefaultDragGestureRecognizer(this, DnDConstants.ACTION_COPY_OR_MOVE, this); this.setDropTarget(new DropTarget(this, DnDConstants.ACTION_COPY_OR_MOVE, this)); addComponentListener(this); m_isResizeable = isResizeable; m_modal = false; setResizable(isResizeable); } /** * Sets the frame to a modal state * @param width * @param height */ public void setModal(int width, int height, Insets fi, JLayeredPane m_pan) { int i; Component[] comps; Component c; Point p; m_modal = true; m_modalDialog = new Dialog((JFrame)null, getTitle(), true); m_modalDialog.setLayout(null); m_modalDialog.setResizable(m_isResizeable); m_modalDialog.setSize(width + fi.left + fi.right, height + fi.top + (fi.bottom * 2)); m_modalDialog.setAlwaysOnTop(true); m_modalDialog.setLocationRelativeTo(null); if (m_pan != null) { // Add/copy the pane's components comps = m_pan.getComponents(); if (comps != null) for (i = 0; i < comps.length; i++) { // Add and reposition the component taking into account the insets c = m_modalDialog.add(comps[i]); p = c.getLocation(); c.setLocation(p.x + fi.left, p.y + fi.top + fi.bottom); } } m_modalDialog.setVisible(true); } @Override public void paint(Graphics g) { Dimension d = getSize(); Dimension m = getMaximumSize(); boolean resize = d.width > m.width || d.height > m.height; d.width = Math.min(m.width, d.width); d.height = Math.min(m.height, d.height); if (resize) { Point p = getLocation(); setVisible(false); setSize(d); setLocation(p); setVisible(true); } super.paint(g); } @Override public void dragDropEnd(DragSourceDropEvent DragSourceDropEvent){} @Override public void dragEnter(DragSourceDragEvent DragSourceDragEvent){} @Override public void dragExit(DragSourceEvent DragSourceEvent){} @Override public void dragOver(DragSourceDragEvent DragSourceDragEvent){} @Override public void dropActionChanged(DragSourceDragEvent DragSourceDragEvent){} @Override public void dragEnter (DropTargetDragEvent dropTargetDragEvent) { dropTargetDragEvent.acceptDrag(DnDConstants.ACTION_COPY_OR_MOVE); } @Override public void dragExit (DropTargetEvent dropTargetEvent) {} @Override public void dragOver (DropTargetDragEvent dropTargetDragEvent) {} @Override public void dropActionChanged (DropTargetDragEvent dropTargetDragEvent){} @Override public synchronized void drop(DropTargetDropEvent dropTargetDropEvent) { try { Transferable tr = dropTargetDropEvent.getTransferable(); if (tr.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) { dropTargetDropEvent.acceptDrop (DnDConstants.ACTION_COPY_OR_MOVE); java.util.List fileList = (java.util.List)tr.getTransferData(DataFlavor.javaFileListFlavor); Iterator iterator = fileList.iterator(); while (iterator.hasNext()) { File file = (File)iterator.next(); if (file.getName().toLowerCase().endsWith(".xml")) { // Do something with the file here } else { System.out.println("Ignored dropped file: " + file.getAbsolutePath()); } } dropTargetDropEvent.getDropTargetContext().dropComplete(true); } else { dropTargetDropEvent.rejectDrop(); } } catch (IOException io) { dropTargetDropEvent.rejectDrop(); } catch (UnsupportedFlavorException ufe) { dropTargetDropEvent.rejectDrop(); } } @Override public void dragGestureRecognized(DragGestureEvent dragGestureEvent) { } public void setTranslucency(float opaquePercent) { try { if (System.getProperty("java.version").substring(0,3).compareTo("1.6") <= 0) { // Code for translucency works in 1.6, raises exception in 1.7 Class awtUtilitiesClass = Class.forName("com.sun.awt.AWTUtilities"); Method mSetWindowOpacity; mSetWindowOpacity = awtUtilitiesClass.getMethod("setWindowOpacity", Window.class, float.class); if (mSetWindowOpacity != null) { if (!m_modal) mSetWindowOpacity.invoke(null, this, opaquePercent); } } else { // If compiling in 1.6 or earlier, comment-out these next two lines if (!m_modal) setOpacity(opaquePercent); } } catch (NoSuchMethodException ex) { } catch (SecurityException ex) { } catch (ClassNotFoundException ex) { } catch (IllegalAccessException ex) { } catch (IllegalArgumentException ex) { } catch (InvocationTargetException ex) { } catch (IllegalComponentStateException ex) { } catch (Throwable t) { } finally { } } @Override public void componentResized(ComponentEvent e) { Dimension d = getSize(); Dimension m = getMaximumSize(); boolean resize = d.width > m.width || d.height > m.height; d.width = Math.min(m.width, d.width); d.height = Math.min(m.height, d.height); if (resize) setSize(d); } @Override public void componentMoved(ComponentEvent e) { } @Override public void componentShown(ComponentEvent e) { } @Override public void componentHidden(ComponentEvent e) { } @Override public void dispose() { if (m_modal) { m_modalDialog.setVisible(false); m_modalDialog = null; } super.dispose(); } public void forceWindowToHaveFocus() { Rectangle bounds; Insets insets; Robot robot = null; if (m_modal) m_modalDialog.setVisible(true); setVisible(true); toFront(); bounds = getBounds(); insets = getInsets(); try { robot = new Robot(); robot.mouseMove(bounds.x + bounds.width / 2, bounds.y + insets.top / 2); robot.mousePress(InputEvent.BUTTON1_MASK); robot.mouseRelease(InputEvent.BUTTON1_MASK); } catch (AWTException ex) { } } protected DragSource m_dragSource; protected boolean m_isResizeable; protected boolean m_modal; protected Dialog m_modalDialog; } </code></pre>
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<java><windows-7><flicker><java-7><jdialog>
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Why does this JDialog flicker in Win7 when modal?
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