[英]How to run a Save As menu on EDT (Java Swing)
(我正在将全屏Java 应用程序升级为在窗口中运行的Java Swing应用程序。)
基本类在EDT(事件调度线程)上作为线程运行,并使用invokeAndWait(this)进行调用。
活动渲染循环位于同一类的方法主体中,但它作为EDT之外的单独线程运行。 (已证明)。
当按下适当的键时,活动的渲染循环将暂停,并调用“另存为”菜单。 “另存为”菜单在EDT上运行,在Linux上看起来不错,但在Windows上看起来不太好。 Windows中的确认菜单(用于文件覆盖)为空白。
private void save_frame() {
setVisible(false);
try {invokeAndWait(new Runnable() {
@Override
public void run() {
try {
if (current_save_folder == null) {
current_save_folder = javax.swing.filechooser.FileSystemView.getFileSystemView().getDefaultDirectory().toString();
}
final JFileChooser saver = new JFileChooser();
saver.setCurrentDirectory(new File(current_save_folder));
saver.setDialogTitle("Save two frames and state as...");
saver.setFileSelectionMode(JFileChooser.FILES_ONLY);
saver.setAcceptAllFileFilterUsed(true);
int approval = saver.showSaveDialog(getParent());
File file = saver.getSelectedFile();
if (approval == saver.APPROVE_OPTION && file != null) {
file = new File(file.getAbsolutePath());
current_save_folder = file.getParent();
File file_in_png = new File(file.getAbsolutePath());
File file_out_png = new File(file.getAbsolutePath());
File file_state = new File(file.getAbsolutePath());
String file_lowercase = file.getAbsolutePath().toLowerCase();
if (file_lowercase.endsWith(".in.png")) {
file = new File(file.getAbsolutePath().replace(".in.png", ""));
} else {
file_in_png = new File(file.getAbsolutePath() + ".in.png");
}
if (file_lowercase.endsWith(".out.png")) {
file = new File(file.getAbsolutePath().replace(".out.png", ""));
} else {
file_out_png = new File(file.getAbsolutePath() + ".out.png");
}
if (file_lowercase.endsWith(".state")) {
file = new File(file.getAbsolutePath().replace(".state", ""));
} else {
file_state = new File(file.getAbsolutePath() + ".state");
}
if (file.exists() || file_in_png.exists() || file_out_png.exists() || file_state.exists()) {
shortName name = new shortName(saver.getSelectedFile().getName());
int answer = JOptionPane.showConfirmDialog(getParent(), "File " + name.getShortName(30) + " already exists!\nOverwrite??", "Yes or No?", JOptionPane.YES_NO_CANCEL_OPTION);
switch (answer) {
case JOptionPane.YES_OPTION:
saver.approveSelection();
try {
System.out.println("saving...");
ImageIO.write(double_buffer.output.image, "png", new File(file.getAbsolutePath() + ".out.png")); // save frame
ImageIO.write(double_buffer.buffer.image, "png", new File(file.getAbsolutePath() + ".in.png"));
// ImageIO.write(data_buffer.display.image, "png", new File(file.getAbsolutePath() + ".display.png")); // cursor movements
// ImageIO.write(data_buffer.image.image, "png", new File(file.getAbsolutePath() + ".sketch.png")); // preloaded image
Preset.write(Main.percept, new File(file.getAbsolutePath() + ".state")); // save with extension *.state
System.out.println("...saved.");
current_save_folder = file.getParent();
} catch (IOException e) { e.printStackTrace(); }
return;
case JOptionPane.NO_OPTION:
System.out.println("save file not accepted");
return;
case JOptionPane.CLOSED_OPTION:
System.out.println("save menu closed");
return;
case JOptionPane.CANCEL_OPTION:
saver.cancelSelection();
System.out.println("save menu cancelled");
return;
}
} else {
try {
System.out.println("saving...");
ImageIO.write(double_buffer.output.image, "png", new File(file.getAbsolutePath() + ".out.png")); // save frame
ImageIO.write(double_buffer.buffer.image, "png", new File(file.getAbsolutePath() + ".in.png"));
// ImageIO.write(data_buffer.display.image, "png", new File(file.getAbsolutePath() + ".display.png")); // cursor movements
// ImageIO.write(data_buffer.image.image, "png", new File(file.getAbsolutePath() + ".sketch.png")); // preloaded image
Preset.write(Main.percept, new File(file.getAbsolutePath() + ".state")); // save with extension *.state
System.out.println("...saved.");
current_save_folder = file.getParent();
} catch (IOException e) { e.printStackTrace(); }
}
}
} catch (Exception E) {
System.err.println("File write error while saving screenshot and state.");
JOptionPane.showMessageDialog(getParent(), "Could not write files.", "Error", JOptionPane.ERROR_MESSAGE);
E.printStackTrace();
}
}
}); } catch (InterruptedException | InvocationTargetException e) { e.printStackTrace(); }
if (windowed_mode) {
setVisible(true);
} else
screen_mode();
hide_cursor();
save_as_running = false;
running = true;
}
经过大量的实验之后,我发现了一种有趣的方式来纠正我的Windows 8中采用Oracle最新Java的确认对话框的外观。
Main类现在扩展JFrame的原因似乎仅仅是让菜单按照应有的方式运行。
出于代码时尚的原因,主类还实现了Runnable,因此运行的第一个代码如下所示:
Main m = new Main();
m.run();
称为Perceptron的基本程序类是用作主程序窗口的JFrame。 使用invokeAndWait(perceptron_runnable)在方法m.run()中以其自己的Runnable实例化Perceptron。
使用执行程序服务从Perceptron构造函数调用活动渲染循环,该循环在EDT外部运行。
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