Java Reference
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sketchChanged = false;
// Status is
unchanged
} catch(Exception e) {
System.err.println(e);
JOptionPane.showMessageDialog(this,
"Error reading a sketch file.",
"File Input Error",
JOptionPane.ERROR_MESSAGE);
return false;
}
return true;
}
Directory "Sketcher 3 opening sketch files"
This method returns true if the file read operation is successful and returns false if an error occurs. You
pass the SketcherModel object that is read from the file to a new method in the Sketcher class, inser-
tModel() . This method has to replace the current sketch with the new one that is passed as the argument.
You can implement the insertModel() method in the Sketcher class like this:
// Insert a new sketch model
public void insertModel(SketcherModel newSketch) {
sketch = newSketch;
// Store the
new sketch
sketch.addObserver(view);
// Add the view
as observer
sketch.addObserver(window);
// Add the app
window as observer
view.repaint();
// Repaint the
view
}
Directory "Sketcher 3 opening sketch files"
After you have loaded the new model, you update the window title bar and record the status as unchanged
in the SketcherFrame object. If you compile Sketcher once more, you can give the file open operation a
workout. The Open dialog should be as shown in Figure 21-3 .
FIGURE 21-3
 
 
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