Hi Ben -
> Question 1:
>
> What class should I look at to get an idea of how to create
> my own custom buttons with actions to do things? Basically what I want to
> do is extremely simple, just have a bunch of GIS icons like rivers,
> railroads, ... and allow the user to toggle them on or off by clicking
(instead of
> using the "Layers" menu).
I actually did this with my last project. The class that does this is
riddled with project specific stuff (I didn't do a good job generalizing
it). But, here is the approach I took (modified slightly so that it should
work a little better with OM4.6).
NOTE: If you want this to show up somewhere if you don't implement Tool,
you'll need to extend something like BasicMapPanel and deal with it in
findAndInit().
1. Extend OMComponent and implement LayerListener, Tool
- although implementing Tool may not be necessary with what you want
to do. If you want it to appear in the OMToolSet then implement Tool
2. Add a JToolbar member variable (e.g. private JToolbar toolBar)
3. if implementing Tool, getFace() of Tool returns the JToolbar (e.g. return
toolBar;)
4. override findAndInit(Object ob)
- if the ob passed instanceof LayerHandler, add this as a layer
listener
5. in the setLayers method (from LayerListener)
- if the getType() == LayerListener.ADD, add a new ToggleButton
instance (see below) to the JToolbar
- you'll need to figure out a good way to associate the icon image
with the button
6. Add your component to the openmap.properties file
I haven't tested this approach under 4.6 but I think the idea is sound
according to the API. If I'm way off, I'm sure Don (or someone) will correct
me. ;)
- Chris
This ToggleButton class will react to the layer being show/hidden through
other means as well and will turn on/off the layer when toggled.
private class ToggleButton extends JToggleButton
implements ComponentListener
{
private Layer layer = null;
ToggleButton(Layer layer)
{
this.layer = layer;
this.setIcon(...);
setToolTipText(layer.getName());
setSelected(layer.isVisible());
addActionListener(this);
layer.addComponentListener(this);
}
///////////////////////////////////////////////////////////////////////////
// ComponentListener methods
/**
* We don't care about resizing or moving
*/
public void componentResized(ComponentEvent e)
{}
public void componentMoved(ComponentEvent e)
{}
/**
* This button listens to the status of its layer. If the
* layer becomes visible, it makes the button toggled on
*/
public void componentShown(ComponentEvent e)
{
if(e.getComponent() == layer && !isSelected())
{
setSelected(true);
}
}
/**
* This button listens to the status of its layer. If the
* layer becomes invisible, it makes the button toggled off
*/
public void componentHidden(ComponentEvent e)
{
if(e.getComponent() == layer && isSelected())
{
setSelected(false);
}
}
/**
* Triggered by the toggle button being clicked
* _at_param e ActionEvent fired by the button.
*/
public void actionPerformed(ActionEvent e)
{
if(!this.equals(e.getSource()))
{
System.err.println("Incorrect source");
return;
}
layerHandler.turnLayerOn(isSelected(), layer);
}
}
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Received on Wed Jul 07 2004 - 16:00:48 EDT