我想知道是否有可能在任务栏上显示进度条,就像Windows资源管理器在进行文件操作时所做的那样?
我看到了许多示例,但它们都涉及到C#。
SWT不可行。
我发现这个功能包含在Java 9中。它是AWT的一部分,使用起来非常简单。
以下是一个简短的示例:
import java.awt.Taskbar;
import java.awt.Taskbar.State;
import javax.swing.JFrame;
import javax.swing.WindowConstants;
/**
* @author fxl
*/
public class TaskbarSample {
public static void main(String[] args) {
// JavaDoc:
// https://docs.oracle.com/javase/9/docs/api/java/awt/Taskbar.html
// MSDNDoc:
// https://msdn.microsoft.com/en-us/library/dd391692(VS.85).aspx
if (Taskbar.isTaskbarSupported() == false) {
return;
}
JFrame dialog = new JFrame("Test - 50%");
dialog.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
dialog.setVisible(true);
Taskbar taskbar = Taskbar.getTaskbar();
taskbar.setWindowProgressState(dialog, State.ERROR);
taskbar.setWindowProgressValue(dialog, 50);
}
}
此网页。
代码:
import org.bridj.Platform;
import org.bridj.Pointer;
import org.bridj.cpp.com.COMRuntime;
import org.bridj.cpp.com.shell.ITaskbarList3;
import org.bridj.jawt.JAWTUtils;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class TaskBarListDemo extends JFrame implements ActionListener, ChangeListener
{
private ITaskbarList3 list;
private JSlider slider;
private Pointer<?> hwnd;
private TaskBarListDemo() throws ClassNotFoundException
{
super("TaskbarList Demo (" + (Platform.is64Bits() ? "64 bits" : "32 bits") + ")");
list = COMRuntime.newInstance(ITaskbarList3.class);
getContentPane().add("Center", new JLabel("Hello Native Windows 7 World !"));
Box box = Box.createVerticalBox();
int min = 0;
int max = 300;
int val = (min + max / 2);
slider = new JSlider(min, max, val);
slider.addChangeListener(this);
box.add(slider);
ButtonGroup group = new ButtonGroup();
for (ITaskbarList3.TbpFlag state : ITaskbarList3.TbpFlag.values())
{
JRadioButton cb = new JRadioButton(state.name());
group.add(cb);
cb.putClientProperty(ITaskbarList3.TbpFlag.class, state);
cb.setSelected(state == ITaskbarList3.TbpFlag.TBPF_NORMAL);
cb.addActionListener(this);
box.add(cb);
}
getContentPane().add("South", box);
}
@Override
protected void finalize() throws Throwable
{
super.finalize();
list.Release();
}
public void setVisible(boolean visible)
{
super.setVisible(visible);
long hwndVal = JAWTUtils.getNativePeerHandle(this);
hwnd = Pointer.pointerToAddress(hwndVal);
list.SetProgressValue((Pointer) hwnd, slider.getValue(), slider.getMaximum());
}
@Override
public void stateChanged(ChangeEvent actionEvent)
{
list.SetProgressValue((Pointer) hwnd, slider.getValue(), slider.getMaximum());
}
@Override
public void actionPerformed(ActionEvent actionEvent)
{
JRadioButton button = ((JRadioButton) actionEvent.getSource());
if (button.isSelected())
{
ITaskbarList3.TbpFlag flag = (ITaskbarList3.TbpFlag) button.getClientProperty(ITaskbarList3.TbpFlag.class);
list.SetProgressValue((Pointer) hwnd, slider.getValue(), slider.getMaximum());
list.SetProgressState((Pointer) hwnd, flag);
}
}
public static void main(String[] arguments) throws Exception
{
TaskBarListDemo f = new TaskBarListDemo();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.pack();
f.setVisible(true);
}
}
Maven
依赖:
<dependencies>
<dependency>
<groupId>com.nativelibs4java</groupId>
<artifactId>bridj</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>net.java.dev.jna</groupId>
<artifactId>jna</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>net.java.dev.jna</groupId>
<artifactId>jna-platform</artifactId>
<version>LATEST</version>
</dependency>
</dependencies>
请注意:
希望这有所帮助。
ITaskbarList3.java
package example;
import com.sun.jna.platform.win32.Guid.IID;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinNT.HRESULT;
public interface ITaskbarList3 {
IID IID_ITASKBARLIST3 = new IID("ea1afb91-9e28-4b86-90e9-9e9f8a5eefaf"); // from ShObjIdl.h
int TBPF_NOPROGRESS = 0;
int TBPF_INDETERMINATE = 0x1;
int TBPF_NORMAL = 0x2;
int TBPF_ERROR = 0x4;
int TBPF_PAUSED = 0x8;
HRESULT SetProgressState(HWND hwnd, int tbpFlags);
}
TaskbarList3.java
package example;
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinNT.HRESULT;
import com.sun.jna.platform.win32.COM.COMInvoker;
public final class TaskbarList3 extends COMInvoker implements ITaskbarList3 {
public TaskbarList3(Pointer pointer) {
setPointer(pointer);
}
@Override
public HRESULT SetProgressState(HWND hwnd, int tbpFlags) {
return (HRESULT) this._invokeNativeObject(
10, // magic number (gathered by trial and error)
new Object[] { this.getPointer(), hwnd, tbpFlags },
HRESULT.class);
}
}
TaskbarPeer.java
package example;
import com.sun.javafx.stage.WindowHelper;
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.Guid.CLSID;
import com.sun.jna.platform.win32.Ole32;
import com.sun.jna.platform.win32.W32Errors;
import com.sun.jna.platform.win32.WTypes;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.ptr.PointerByReference;
import javafx.stage.Stage;
public final class TaskbarPeer {
public static void setIndeterminateProgress(Stage stage, boolean indeterminate) {
final var peer = WindowHelper.getPeer(stage);
final long windowHandle = peer.getRawHandle();
final var clsid = new CLSID("56FDF344-FD6D-11d0-958A-006097C9A090"); // from ShObjIdl.h
final var taskbarListPointerRef = new PointerByReference();
var hr = Ole32.INSTANCE.CoCreateInstance(clsid, null, WTypes.CLSCTX_SERVER,
ITaskbarList3.IID_ITASKBARLIST3, taskbarListPointerRef);
if (W32Errors.FAILED(hr)) {
throw new RuntimeException("failed with code: " + hr.intValue());
}
final TaskbarList3 taskbarList = new TaskbarList3(taskbarListPointerRef.getValue());
final var hwnd = new HWND(new Pointer(windowHandle));
final int progressState = indeterminate ? ITaskbarList3.TBPF_INDETERMINATE : ITaskbarList3.TBPF_NOPROGRESS;
hr = taskbarList.SetProgressState(hwnd, progressState);
if (W32Errors.FAILED(hr)) {
throw new RuntimeException("failed with code: " + hr.intValue());
}
}
}
Sample.java
package example;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;
public final class Sample extends Application {
private boolean indeterminateProgressState = false;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
final Button btn = new Button("Click me!");
primaryStage.setScene(new Scene(btn));
primaryStage.sizeToScene();
primaryStage.show();
btn.setOnAction(evt -> {
indeterminateProgressState = !indeterminateProgressState;
TaskbarPeer.setIndeterminateProgress(primaryStage, indeterminateProgressState);
});
}
}
Windows 通过 COM 公开了这个功能。我相信对于您来说,“平面 DLL” 调用可能更容易,但如果您可以使用 COM,则可以完成此操作。COM 接口是 ITaskbarList3(还有一个从它继承的 ITaskbarList4)。http://msdn.microsoft.com/en-us/library/dd391692(VS.85).aspx 对其进行了文档化。SetProgressState 和 SetProgressValue 是您想要调用的方法。状态包括正常(绿色)、暂停(黄色)、错误(红色)、不确定(扫描绿色)和无。在 MSDN 页面上,一些社区成员添加了从 VB 和 C# 调用此 COM 组件的详细信息 - 这可能会帮助您弄清所需的 Java 设置和拆卸。