Extending the GUI - Beginning Java - page 1063

Directory "Sketcher 4 creating text elements"
This method does something only if the element type is TEXT and button 1 was clicked. The dialog for
entering text is displayed using the showInputDialog() method. You only want to create an element if
text is not null and not empty. If the dialog Cancel button is selected, text is null , and text is empty
if OK is selected without entering any text.
You obtain a Graphics2D object from the view so you can obtain a FontMetrics object from the graph-
ics context for the current font. You then create an Element.Text object by calling its constructor.
Because you reference the TEXT constant here, you must add a static import for the SketcherConstants
class members to the SketcherView class file:
import static Constants.SketcherConstants.*;
You also need to add an import for javax.swing.JOptionPane , or you can change the import for JCom-
ponent to import all names from the package.
A mouse clicked event occurs when the mouse is pressed and then immediately released. Of course, this
also causes mouse pressed and mouse released events to occur as well. You rely on the mousePressed()
method to record the start point and the button state, but you must prevent this method and the
mousedDragged() and mouseReleased() methods from doing anything else when the element type is
TEXT . Add the following statement after the statement that records the start point in mousePressed() :
public void mousePressed(MouseEvent e) {
start = e.getPoint(); // Save the cursor position
in start
buttonState = e.getButton(); // Record which button was
pressed
if(theApp.getWindow().getElementType() == TEXT) return;
// Rest of the code as before...
}
Directory "Sketcher 4 creating text elements"
The mouseDragged() implementation can be:
public void mouseDragged(MouseEvent e) {
last = e.getPoint(); // Save cursor
position
if(theApp.getWindow().getElementType() == TEXT) return;
// Rest of the method code as before...
}