[英]Is this the only way to teach a Java Frame something about the Aero Snap feature of Windows?
如果我通過單擊Windows WindowDecoration的最小化按鈕並通過Alt-Tabbing最小化它或在Windows任務欄中單擊它來最小化Aero捕捉到屏幕左側的JFrame
,框架將恢復正確地捕捉到剩下。 好!
但是,如果我最小化幀
setExtendedState( getExtendedState() | Frame.ICONIFIED );
並通過將鼠標懸停在Windows TaskBar上來查看預覽,它會將框架顯示錯誤的位置。 通過Alt-Tabbing取消最小化或在Windows任務欄中單擊它后,框架將在此錯誤的位置和大小恢復。 幀邊界是“未綁定”值,如果您將幀拖離ScreenBorder,Windows通常會記住恢復該值。
Bug的屏幕錄制:
我的結論是,Java不了解AeroSnap並向Windows提供了錯誤的界限。 (例如Toolkit.getDefaultToolkit().isFrameStateSupported( Frame.MAXIMIZED_VERT ) );
返回false。)
這是我對bug的修復:
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Point;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
/**
* Fix for the "Frame does not know the AeroSnap feature of Windows"-Bug.
*
* @author bobndrew 20160106
*/
public class SwingFrameStateWindowsAeroSnapBug extends JFrame
{
Point location = null;
Dimension size = null;
public SwingFrameStateWindowsAeroSnapBug( final String title )
{
super( title );
initUI();
}
private void initUI()
{
setDefaultCloseOperation( EXIT_ON_CLOSE );
setLayout( new FlowLayout() );
final JButton minimize = new JButton( "Minimize" );
final JButton maximize = new JButton( "Maximize" );
final JButton normal = new JButton( "Normal" );
add( normal );
add( minimize );
add( maximize );
pack();
setSize( 200, 200 );
final ActionListener listener = actionEvent ->
{
if ( actionEvent.getSource() == normal )
{
setExtendedState( Frame.NORMAL );
}
else if ( actionEvent.getSource() == minimize )
{
//Size and Location have to be saved here, before the minimizing of an AeroSnapped WindowsWindow leads to wrong values:
location = getLocation();
size = getSize();
System.out.println( "saving location (before iconify) " + size + " and " + location );
setExtendedState( getExtendedState() | Frame.ICONIFIED );//used "getExtendedState() |" to preserve the MAXIMIZED_BOTH state
//does not fix the bug; needs a Window-Drag after DeMinimzing before the size is applied:
// setSize( size );
// setLocation( location );
}
else if ( actionEvent.getSource() == maximize )
{
setExtendedState( getExtendedState() | Frame.MAXIMIZED_BOTH );
}
};
minimize.addActionListener( listener );
maximize.addActionListener( listener );
normal.addActionListener( listener );
addWindowStateListener( windowEvent ->
{
System.out.println( "oldState=" + windowEvent.getOldState() + " newState=" + windowEvent.getNewState() );
if ( size != null && location != null )
{
if ( windowEvent.getOldState() == Frame.ICONIFIED )
{
System.out.println( "Fixing (possibly) wrong size and location on de-iconifying to " + size + " and " + location + "\n" );
setSize( size );
setLocation( location );
//Size and Location should only be applied once. Set NULL to avoid a wrong DeMinimizing of a following Windows-Decoration-Button-Minimize!
size = null;
location = null;
}
else if ( windowEvent.getOldState() == (Frame.ICONIFIED | Frame.MAXIMIZED_BOTH) )
{
System.out.println( "Set size and location to NULL (old values: " + size + " and " + location + ")" );
//Size and Location does not have to be applied, Java can handle the MAXIMIZED_BOTH state. Set NULL to avoid a wrong DeMinimizing of a following Windows-Decoration-Button-Minimize!
size = null;
location = null;
}
}
} );
}
public static void main( final String[] args )
{
SwingUtilities.invokeLater( new Runnable()
{
@Override
public void run()
{
new SwingFrameStateWindowsAeroSnapBug( "AeroSnap and the Frame State" ).setVisible( true );
}
} );
}
}
這似乎適用於Windows7下的所有情況,但感覺太亂用窗口管理了。 我出於某種原因避免在Linux或MacOS下測試這個;-)
是否有更好的方法讓AeroSnap和Java Frames協同工作?
編輯:
我在Oracle上提交了一個錯誤: http : //bugs.java.com/bugdatabase/view_bug.do?bug_id=8147840
是否有更好的方法讓AeroSnap和Java Frames協同工作?
好多了。 直接設置擴展狀態會繞過操作系統設置它的處理。
如果你看一下JFrame#setExtendedState
的源代碼,你會看到它調用了FramePeer
的setState
方法。 JDK的FramePeer
接口的JFrame
實現是WFramePeer
類,它將setState
方法聲明為native
。 因此,在Oracle對此做一些事情或使用本機代碼之前,你運氣不好(見下文)。
幸運的是,您不必為事件監聽器和緩存邊界而瘋狂。 隱藏和顯示框架足以將大小“重置”為最小化之前的大小:
public class AeroResize extends JFrame {
public AeroResize(final String title) {
super(title);
initUI();
}
private void initUI() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new FlowLayout());
final JButton minimize = new JButton("Minimize");
final JButton maximize = new JButton("Maximize");
final JButton normal = new JButton("Normal");
add(normal);
add(minimize);
add(maximize);
pack();
minimize.addActionListener(e -> {
setVisible(false);
setExtendedState(getExtendedState() | JFrame.ICONIFIED);
setVisible(true);
// setLocation(getLocationOnScreen()); // Needed only for the preview. See comments section below.
});
}
public static void main(final String[] args) {
SwingUtilities.invokeLater(() -> new AeroResize("AeroSnap and the Frame State").setVisible(true));
}
}
雖然這確實有副作用,沒有給出框架內容的詳細預覽:
如果您想使用JNA ,那么您可以完全模仿本機平台的最小化。 您需要在構建路徑中包含jna.jar
和jna.jar
jna-platform.jar
。
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import com.sun.jna.Native;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.HWND;
public class AeroResize extends JFrame {
public AeroResize(final String title) {
super(title);
initUI();
}
private void initUI() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new FlowLayout());
final JButton minimize = new JButton("Minimize");
final JButton maximize = new JButton("Maximize");
final JButton normal = new JButton("Normal");
add(normal);
add(minimize);
add(maximize);
pack();
minimize.addActionListener(e -> {
HWND windowHandle = new HWND(Native.getComponentPointer(AeroResize.this));
User32.INSTANCE.CloseWindow(windowHandle);
});
}
public static void main(final String[] args) {
SwingUtilities.invokeLater(() -> new AeroResize("AeroSnap and the Frame State").setVisible(true));
}
}
這是非常自我解釋的。 你得到一個指向窗口的指針,並使用本機CloseWindow
(實際上最小化,去圖)。 請注意,我編寫它的簡約方法會在第一次按下按鈕時導致一個小延遲,因為User32
實例已加載。 您可以在啟動時加載它以避免第一次延遲。
信用證轉到這里接受的答案 。
這似乎是一個Swing bug。 關於Bug數據庫的錯誤報告:
JDK-7029238:在捕捉表單時未調用componentResized
在這個報告中,錯誤無法再現,現在您遇到了相同的錯誤(我認為它是相同的,或至少相關),也許是重新打開此報告的好時機。 (我沒有找到任何其他參考,所以我認為它沒有被修復)
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