Re: Selection Listener

Subject: Re: Selection Listener

From: Chris Adamson <email@hidden>

Date: Fri, 15 Jul 2005 10:19:40 -0400

Delivered-to: email@hidden

On Jul 15, 2005, at 9:03 AM, Elliotte Harold wrote:

Is there any way for a MovieController to tell my app when the user has selected or deselected something? My specific need is to enable or disable various menu items such as Cut depending on whether or not there's a selection.

I love questions that are things I haven't tried before and yet don't take very long to code. The key is to set an ActionFilter on the MovieController. Here's a hack of the book's MovieController example, set to allow editing and with an ActionFilter that just catches the time-related callbacks (see the javadocs - they actually don't suck for this class).

import java.awt.*;

import quicktime.*;

import quicktime.io.*;

import quicktime.std.*;

import quicktime.std.movies.*;

import quicktime.app.view.*;

import quicktime.std.clocks.*;

public class TestActionFilter extends Frame {

public TestActionFilter (Movie m) throws QTException {

super ("Basic QT Controller");

MovieController mc = new MovieController(m);

mc.enableEditing(true); // ew, API should be setEditingEnabled()

mc.setActionFilter (new HiElliotte());

QTComponent qc = QTFactory.makeQTComponent (mc);

Component c = qc.asComponent();

add (c);

pack();

}

public static void main (String[] args) {

try {

QTSession.open();

QTFile file =

QTFile.standardGetFilePreview (QTFile.kStandardQTFileTypes);

OpenMovieFile omFile = OpenMovieFile.asRead (file);

Movie m = Movie.fromFile (omFile);

Frame f = new TestActionFilter (m);

f.pack();

f.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

public class HiElliotte extends ActionFilter {

public boolean execute(MovieController mc,

int action,

TimeRecord tr) {

if (action == StdQTConstants.mcActionSetSelectionBegin) {

System.out.println ("mcActionSetSelectionBegin");

} else if (action == StdQTConstants.mcActionSetSelectionDuration) {

System.out.println ("mcActionSetSelectionDuration");

}

return super.execute (mc, action, tr);

}

[chrisg5:~/dev/experiments/actionfilter] cadamson% java TestActionFilter

2005-07-15 10:13:19.984 java[1950] [Java CocoaComponent compatibility mode]: Enabled

mcActionSetSelectionBegin

mcActionSetSelectionDuration

mcActionSetSelectionBegin

mcActionSetSelectionDuration

...

Note that I got a flurry of these when I dragged across the scrubber to select, and even when I did a shift-click. When I cleared the selection by just clicking elsewhere in the movie, all I got was mcActionSetSelectionDuration. Maybe what you should do is to check the MC's selection when you get this callback and enable/disable appropriately. Looks like you'll get more callbacks than you want, but hopefully it won't be too expensive to handle.

--Chris

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Re: Selection Listener
- From: Elliotte Harold <email@hidden>

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>Selection Listener (From: Elliotte Harold <email@hidden>)