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Class symantec.itools.awt.InvisibleButton

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Canvas
                   |
                   +----symantec.itools.awt.InvisibleButton

public class InvisibleButton

extends Canvas

implements TransparencyTrick

╖ Create a "hot spot" on an image or on a component.
╖ Accept or yield focus.
╖ Respond to a user event.
╖ Send an action event to another component.

╖ Buttons accept and yield focus automatically by default.
╖ Buttons accept clicked events automatically by default.
╖ To send an action event to another component, use the Interaction Wizard. Optionally, you can override the InvisibleButtonÆs click event in project source code.
╖ Overlapping components - browsers handle components layered on each other differently. Some browsers display/layer the InvisibleButtons on top of a particular component, while others display them underneath. Therefore, it often requires two sets of InvisibleButtons to ensure that one is "on top"; one on top of the particular component and the other underneath.

pressed

True if the button is currently pressed.

InvisibleButton()

Constructs an InvisibleButton.

mouseDown(Event, int, int)

Processes MOUSE_DOWN events.

mouseUp(Event, int, int)

Processes MOUSE_UP events.

paint(Graphics)

Paints this component using the given graphics context.

update(Graphics)

Handles redrawing of this component on the screen.

  protected boolean pressed

True if the button is currently pressed.

  public InvisibleButton()

Constructs an InvisibleButton.

  public void update(Graphics g)

Handles redrawing of this component on the screen. This is a standard Java AWT method which gets called by the Java AWT (repaint()) to handle repainting this component on the screen. The graphics context clipping region is set to the bounding rectangle of this component and its <0,0> coordinate is this component's top-left corner. Typically this method paints the background color to clear the component's drawing space, sets graphics context to be the foreground color, and then calls paint() to draw the component. It is overridden here to prevent the flicker associated with the standard update() method's repainting of the background before painting the component itself.

Parameters:

g - the graphics context

Overrides:

update in class Component

See Also:

repaint, paint

  public void paint(Graphics g)

Paints this component using the given graphics context. This is a standard Java AWT method which typically gets called by the AWT to handle painting this component. It paints this component using the given graphics context. The graphics context clipping region is set to the bounding rectangle of this component and its <0,0> coordinate is this component's top-left corner.

It paints what is under the button, so as to appear invisible.

Parameters:

g - the graphics context used for painting

Overrides:

paint in class Canvas

See Also:

repaint, update

  public boolean mouseDown(Event e,
                           int x,
                           int y)

Processes MOUSE_DOWN events. This is a standard Java AWT method which gets called by the AWT method handleEvent() in response to receiving a MOUSE_DOWN event. These events occur when the mouse button is pressed while inside this component.

Parameters:

e - the event

x - the component-relative horizontal coordinate of the mouse

y - the component-relative vertical coordinate of the mouse

Returns:

always true since the event was handled

Overrides:

mouseDown in class Component

See Also:

mouseUp, handleEvent

  public boolean mouseUp(Event e,
                         int x,
                         int y)

Processes MOUSE_UP events. This is a standard Java AWT method which gets called by the AWT method handleEvent() in response to receiving a MOUSE_UP event. These events occur when the mouse button is released while inside this component. If the mouse was pressed inside the button then an event is posted.

Parameters:

e - the event

x - the component-relative horizontal coordinate of the mouse

y - the component-relative vertical coordinate of the mouse

Returns:

always true since the event was handled

Overrides:

mouseUp in class Component

See Also:

mouseDown, handleEvent

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