我有一个未修饰的JavaFX Stage,以及我自己的最小化,最大化和关闭按钮.但遗憾的是,与装饰行为相比,单击Windows 7中的任务栏图标不会自动最小化舞台.
有没有办法通过单击任务栏图标来最小化纯Java代码的未修饰阶段？如果不是,我怎么能用JNA做到这一点？
编辑: 好的,我一直试图用JNA来解决这个问题,但是在C/C++/JNA旁边做了很多,我设置它有点麻烦.如果有人帮我把各个部分放在一起,我将不胜感激.
到目前为止,这是我的代码:
public final class Utils {
static {
if (PlatformUtil.isWin7OrLater()) {
Native.register("shell32");
Native.register("user32");
}
}
// Apparently, this is the event I am after
public static final int WM_ACTIVATEAPP = 0x1C;
public static void registerMinimizeHandler(Stage stage) {
// Hacky way to get a pointer to JavaFX Window
Pointer pointer = getWindowPointer(stage);
WinDef.HWND hwnd = new WinDef.HWND(pointer);
// Here's my minimize/activate handler
WinUser.WindowProc windowProc = new MinimizeHandler(stage);
Pointer magicPointer = ... set this to point to windowProc?
// This.. apparently, re-sets the WndProc? But how do I get the "magicPointer" that is "attached" to the windowProc?
User32.INSTANCE.SetWindowLong(hwnd, User32.GWL_WNDPROC, magicPointer);
}
}
private static class MinimizeHandler implements WinUser.WindowProc {
private Stage stage;
private MinimizeHandler(Stage stage) {
this.stage = stage;
}
@Override
public WinDef.LRESULT callback(WinDef.HWND hWnd, int uMsg, WinDef.WPARAM wParam, WinDef.LPARAM lParam) {
if (uMsg == WM_ACTIVATEAPP) {
System.out.println("ACTIVATE");
}
return User32.INSTANCE.DefWindowProc(hWnd, uMsg, wParam, lParam);
}
}
private static Pointer getWindowPointer(Stage stage) {
try {
TKStage tkStage = stage.impl_getPeer();
Method getPlatformWindow = tkStage.getClass().getDeclaredMethod("getPlatformWindow" );
getPlatformWindow.setAccessible(true);
Object platformWindow = getPlatformWindow.invoke(tkStage);
Method getNativeHandle = platformWindow.getClass().getMethod( "getNativeHandle" );
getNativeHandle.setAccessible(true);
Object nativeHandle = getNativeHandle.invoke(platformWindow);
return new Pointer((Long) nativeHandle);
} catch (Throwable e) {
System.err.println("Error getting Window Pointer");
return null;
}
}
编辑2:我最终得到了这个,但是一旦我重新设置了WNDPROC,我的未修饰的窗口没有响应任何事件..我正在为一个独立的例子提供100点声望的赏金有一个有效的解决方案 Windows(7+)只是没关系,我甚至不知道这在其他平台上是如何表现的.
编辑3: 嗯,我有点放弃了这一个......我把所有东西都设置正确,并收到了事件,但是在找出正确的事件要听的时候遇到了问题.
由于对这个问题有兴趣,如果有人想继续这个,这是我的最终代码(希望它应该"开箱即用"):
public final class Utils {
static interface ExtUser32 extends StdCallLibrary, User32 {
ExtUser32 INSTANCE = (ExtUser32) Native.loadLibrary(
"user32",
ExtUser32.class,
W32APIOptions.DEFAULT_OPTIONS);
WinDef.LRESULT CallWindowProcW(
Pointer lpWndProc,
Pointer hWnd,
int msg,
WinDef.WPARAM wParam,
WinDef.LPARAM lParam);
int SetWindowLong(HWND hWnd, int nIndex, com.sun.jna.Callback wndProc) throws LastErrorException;
}
// Some possible event types
public static final int WM_ACTIVATE = 0x0006;
public static final int WM_ACTIVATEAPP = 0x1C;
public static final int WM_NCACTIVATE = 0x0086;
public static void registerMinimizeHandler(Stage stage) {
Pointer pointer = getWindowPointer(stage);
WinDef.HWND hwnd = new WinDef.HWND(pointer);
long old = ExtUser32.INSTANCE.GetWindowLong(hwnd, User32.GWL_WNDPROC);
MinimizeHandler handler = new MinimizeHandler(stage, old);
ExtUser32.INSTANCE.SetWindowLong(hwnd, User32.GWL_WNDPROC, handler);
}
private static Pointer getWindowPointer(Stage stage) {
try {
TKStage tkStage = stage.impl_getPeer();
Method getPlatformWindow = tkStage.getClass().getDeclaredMethod("getPlatformWindow" );
getPlatformWindow.setAccessible(true);
Object platformWindow = getPlatformWindow.invoke(tkStage);
Method getNativeHandle = platformWindow.getClass().getMethod( "getNativeHandle" );
getNativeHandle.setAccessible(true);
Object nativeHandle = getNativeHandle.invoke(platformWindow);
return new Pointer((Long) nativeHandle);
} catch (Throwable e) {
System.err.println("Error getting Window Pointer");
return null;
}
}
private static class MinimizeHandler implements WinUser.WindowProc, StdCallLibrary.StdCallCallback {
private Pointer mPrevWndProc32;
private Stage stage;
private MinimizeHandler(Stage stage, long oldPtr) {
this.stage = stage;
mPrevWndProc32 = new Pointer(oldPtr);
// Set up an event pump to deliver messages for JavaFX to handle
Thread thread = new Thread() {
@Override
public void run() {
int result;
WinUser.MSG msg = new WinUser.MSG();
while ((result = User32.INSTANCE.GetMessage(msg, null, 0, 0)) != 0) {
if (result == -1) {
System.err.println("error in get message");
break;
}
else {
System.out.println("got message: " + result);
User32.INSTANCE.TranslateMessage(msg);
User32.INSTANCE.DispatchMessage(msg);
}
}
}
};
thread.start();
}
@Override
public WinDef.LRESULT callback(WinDef.HWND hWnd, int uMsg, WinDef.WPARAM wParam, WinDef.LPARAM lParam) {
if (uMsg == WM_ACTIVATEAPP) {
// Window deactivated (wParam == 0)... Here's where I got stuck and gave up,
// this is probably not the best event to listen to.. the app
// does indeed get iconified now by pressing the task-bar button, but it
// instantly restores afterwards..
if (wParam.intValue() == 0) {
stage.setIconified(true);
}
return new WinDef.LRESULT(0);
}
// Let JavaFX handle other events
return ExtUser32.INSTANCE.CallWindowProcW(
mPrevWndProc32,
hWnd.getPointer(),
uMsg,
wParam,
lParam);
}
}
}
bri*_*ian 10
您可以设置适当的窗口样式.它适用于XP,但在Windows 7 32位应该没问题.我认为(但不能测试)如果你使用64位然后更改为Ptr窗口函数,即.GetWindowLongPtr.
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinUser;
import static com.sun.jna.platform.win32.WinUser.GWL_STYLE;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class JNATest extends Application {
public static void main(String[] args) { launch(args); }
@Override
public void start(Stage stage) {
TextArea ta = new TextArea("output\n");
VBox root = new VBox(5,ta);
Scene scene = new Scene(root,800,200);
stage.setTitle("Find this window");
stage.setScene(scene);
stage.show();
//gets this window (stage)
long lhwnd = com.sun.glass.ui.Window.getWindows().get(0).getNativeWindow();
Pointer lpVoid = new Pointer(lhwnd);
//gets the foreground (focused) window
final User32 user32 = User32.INSTANCE;
char[] windowText = new char[512];
HWND hwnd = user32.GetForegroundWindow();
//see what the title is
user32.GetWindowText(hwnd, windowText, 512);
//user32.GetWindowText(new HWND(lpVoid), windowText, 512);//to use the hwnd from stage
String text=(Native.toString(windowText));
//see if it's the same pointer
ta.appendText("HWND java:" + lpVoid + " HWND user32:"+hwnd+" text:"+text+"\n");
//change the window style if it's the right title
if (text.equals(stage.getTitle())){
//the style to change
int WS_DLGFRAME = 0x00400000;//s/b long I think
//not the same constant here??
ta.appendText("windows api:"+WS_DLGFRAME+" JNA: "+WinUser.SM_CXDLGFRAME);
int oldStyle = user32.GetWindowLong(hwnd, GWL_STYLE);
int newStyle = oldStyle & ~0x00400000; //bitwise not WS_DLGFRAME means remove the style
newStyle = newStyle & ~0x00040000;//WS_THICKFRAME
user32.SetWindowLong(hwnd, GWL_STYLE, newStyle);
}
}
}
我的猜测是你替换最后3行
long oldStyleLong = user32.GetWindowLongPtr(hwnd, GWL_STYLE).longValue();
long newStyleLong = oldStyleLong & ~ 0x00400000l;
user32.SetWindowLongPtr(hwnd, GWL_STYLE, new BaseTSD.LONG_PTR(newStyleLong));
对于64位.我想我的User32.dll中没有这些功能,所以我无法测试它.那里有很多无关的代码,主要用于测试或教学.一旦弄清楚要做什么,就删除未使用的线.
PS.不要添加newStyle = newStyle & ~0x00020000;//WS_MINIMIZEBOX.这是JavaFX不用于未修饰的样式标志之一.这就是为什么没有最小化的原因.也许如果您尝试设置未修饰的阶段并添加(使用|,而不是〜)最小化框标记,您将得到相同的结果.有工具可以从任何窗口查找所有样式标志.
这是使用舞台的HWND改变未修饰阶段的最简单的代码量.
public void start(Stage stage) {
Scene scene = new Scene(new Pane(new Label("Hello World")));
stage.initStyle(StageStyle.UNDECORATED);
stage.setTitle("Find this window");
stage.setScene(scene);
stage.show();
long lhwnd = com.sun.glass.ui.Window.getWindows().get(0).getNativeWindow();
Pointer lpVoid = new Pointer(lhwnd);
HWND hwnd = new HWND(lpVoid);
final User32 user32 = User32.INSTANCE;
int oldStyle = user32.GetWindowLong(hwnd, GWL_STYLE);
System.out.println(Integer.toBinaryString(oldStyle));
int newStyle = oldStyle | 0x00020000;//WS_MINIMIZEBOX
System.out.println(Integer.toBinaryString(newStyle));
user32.SetWindowLong(hwnd, GWL_STYLE, newStyle);
}
它会打印出之前和之后的样式标志,以便您可以查找设置的样式.