Java 对操作系统任务栏进行操作

本程序是SWT Win32 Extension的一个实例

http://feeling.sourceforge.net/index.php?

 

import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.sf.feeling.swt.win32.extension.Win32; import org.sf.feeling.swt.win32.extension.shell.ApplicationBar; import org.sf.feeling.swt.win32.extension.shell.Windows; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; public class TaskbarSnippet { private Shell shell; private Button onTopBtn; private Button autoHideBtn; public TaskbarSnippet() { shell = new Shell(Display.getDefault()); GridLayout layout = new GridLayout(); layout.numColumns = 2; shell.setLayout(layout); shell.setText("Task Bar Snippet"); new Label(shell, SWT.NONE).setText("Current TaskBar State:"); final Label statusLabel = new Label(shell, SWT.NONE); statusLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); statusLabel.setText(getTaskbarState()); Composite taskBarArea = new Composite(shell, SWT.NONE); GridData gd = new GridData(GridData.FILL_HORIZONTAL); gd.horizontalSpan = 2; taskBarArea.setLayoutData(gd); layout = new GridLayout(); layout.numColumns = 2; layout.marginHeight = 0; layout.marginWidth = 0; taskBarArea.setLayout(layout); if (Win32.getWin32Version() <= Win32.VERSION(5, 0)) { new Label(taskBarArea, SWT.NONE).setText("Check TaskBar State:"); Button autoHideBtn = new Button(taskBarArea, SWT.CHECK); autoHideBtn.setEnabled(false); autoHideBtn.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); autoHideBtn.setText("Auto-hide the taskbar"); new Label(taskBarArea, SWT.NONE); Button onTopBtn = new Button(taskBarArea, SWT.CHECK); onTopBtn.setEnabled(false); onTopBtn.setText("Keep the taskbar on top of other windows"); new Label(taskBarArea, SWT.NONE); Button applyBtn = new Button(taskBarArea, SWT.PUSH); applyBtn.setText("Refresh"); gd = new GridData(); gd.widthHint = 60; applyBtn.setLayoutData(gd); applyBtn.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { refresh(); statusLabel.setText(getTaskbarState()); Display.getDefault().asyncExec(new Runnable(){ public void run() { shell.pack(); } }); } }); } else { new Label(taskBarArea, SWT.NONE).setText("Setup TaskBar State:"); autoHideBtn = new Button(taskBarArea, SWT.CHECK); autoHideBtn.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); autoHideBtn.setText("Auto-hide the taskbar"); new Label(taskBarArea, SWT.NONE); onTopBtn = new Button(taskBarArea, SWT.CHECK); onTopBtn.setText("Keep the taskbar on top of other windows"); new Label(taskBarArea, SWT.NONE); Button applyBtn = new Button(taskBarArea, SWT.PUSH); applyBtn.setText("Apply"); gd = new GridData(); gd.widthHint = 60; applyBtn.setLayoutData(gd); applyBtn.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { if (onTopBtn.getSelection() && autoHideBtn.getSelection()) { ApplicationBar.setAppBarState(shell.handle, Win32.STATE_AUTOHIDE_ALWAYSONTOP); } else if (onTopBtn.getSelection()) { ApplicationBar.setAppBarState(shell.handle, Win32.STATE_ALWAYSONTOP); } else if (autoHideBtn.getSelection()) { ApplicationBar.setAppBarState(shell.handle, Win32.STATE_AUTOHIDE); } else { ApplicationBar.setAppBarState(shell.handle, Win32.STATE_NONE); } statusLabel.setText(getTaskbarState()); Display.getDefault().asyncExec(new Runnable(){ public void run() { shell.pack(); } }); } }); } shell.layout(); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!Display.getDefault().readAndDispatch()) Display.getDefault().sleep(); } Display.getDefault().dispose(); } private String getTaskbarState() { int barState = ApplicationBar.getAppBarState(Windows.getSystemTray()); switch (barState) { case Win32.STATE_ALWAYSONTOP: return "Taskbar is always on top"; case Win32.STATE_AUTOHIDE: return "Taskbar auto-hides when inactive"; case Win32.STATE_AUTOHIDE_ALWAYSONTOP: return "Taskbar is always on top and auto-hides when inactive"; default: return "Taskbar is not always on top"; } } private void refresh() { onTopBtn .setSelection(ApplicationBar.getAppBarState(shell.handle) == Win32.STATE_ALWAYSONTOP || ApplicationBar.getAppBarState(shell.handle) == Win32.STATE_AUTOHIDE_ALWAYSONTOP); autoHideBtn .setSelection(ApplicationBar.getAppBarState(shell.handle) == Win32.STATE_AUTOHIDE || ApplicationBar.getAppBarState(shell.handle) == Win32.STATE_AUTOHIDE_ALWAYSONTOP); } public static void main(String[] args) { new TaskbarSnippet(); } }