[官方Demo]ScreenTransitionsDemo 银幕跳转
[官方Demo]ScreenTransitionsDemo 屏幕跳转
ScreenTransitionsDemo.java
/*
* ScreenTransitionsDemo.java
*
* Copyright �1998-2010 Research In Motion Ltd.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.ui.screentransitionsdemo;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.ui.component.*;
/**
* A sample application to demonstrate the use of the TransitionContext class to
* create screen transitions.
*/
public final class ScreenTransitionsDemo extends UiApplication
{
private boolean _threadRunning;
private boolean _pauseThread;
private TransitionThread _tt;
/**
* Entry point for application
* @param args Command line arguments (not used)
*/
public static void main(String[] args)
{
// Create a new instance of the application and make the currently
// running thread the application's event dispatch thread.
ScreenTransitionsDemo app = new ScreenTransitionsDemo();
app.enterEventDispatcher();
}
/**
* Creates a new ScreenTransitionsDemo object
*/
public ScreenTransitionsDemo()
{
pushScreen(new ScreenTransitionsDemoScreen());
}
/**
* Pauses or resumes the screen transitions thread
*/
public void startOrStopThread()
{
if(_threadRunning == false)
{
_tt = new TransitionThread();
_tt.start();
_threadRunning = true;
}
else
{
if(_pauseThread)
{
_pauseThread = false;
}
else
{
_pauseThread = true;
}
}
}
/**
* MainScreen class for the ScreenTransitionsDemo application
*/
final class ScreenTransitionsDemoScreen extends MainScreen
{
/**
* Creates a new ScreenTransitionsDemoScreen object
*/
ScreenTransitionsDemoScreen()
{
setTitle("Screen Transitions Demo");
add(new LabelField("Click trackball or screen to start and stop animation", Field.NON_FOCUSABLE));
}
/**
* @see Screen#invokeAction(int)
*/
protected boolean invokeAction(int action)
{
switch( action )
{
case ACTION_INVOKE:
{
startOrStopThread();
return true;
}
}
return super.invokeAction(action);
}
/**
* @see Screen#TouchEvent(TouchEvent)
*/
public boolean touchEvent(TouchEvent event)
{
if(event.getEvent() == TouchEvent.UNCLICK)
{
invokeAction(ACTION_INVOKE);
return true;
}
return super.touchEvent(event);
}
}
/**
* A thread class to present a sequence of screen transitions
*/
final class TransitionThread extends Thread
{
public static final int SLIDE = 0;
public static final int FADE = 1;
public static final int WIPE = 2;
public static final int ZOOM = 3;
boolean _pushed;
/**
* Default constructor
*/
TransitionThread()
{
}
/**
* @see Runnable#run()
*/
public void run()
{
int type = 0;
while(true)
{
while(_pauseThread)
{
try
{
// Sleep so we don't spin
sleep(500);
}
catch(InterruptedException e)
{
}
}
if(!_pushed)
{
// Push a screen to demonstrate a screen transition
push(type);
snooze();
}
if(!_pauseThread)
{
pop();
}
// Set the transition type for the next iteration
if(type == 3)
{
type = 0;
}
else
{
type ++;
}
}
}
/**
* Removes a TransitionScreen from the stack
*/
void pop()
{
synchronized(UiApplication.getEventLock())
{
Screen activeScreen = getActiveScreen();
popScreen(activeScreen);
_pushed = false;
}
}
/**
* Creates a TransitionContext object for both pushing and popping a
* screen pushes a TransitionScreen onto the stack.
* @param type Represents the type of screen transitions to execute
*/
void push(int type)
{
TransitionScreen screen = null;
TransitionContext transitionContextIn;
TransitionContext transitionContextOut;
UiEngineInstance engine = Ui.getUiEngineInstance();
switch(type)
{
case SLIDE:
screen = new TransitionScreen("Slider", Color.BEIGE);
transitionContextIn = new TransitionContext(TransitionContext.TRANSITION_SLIDE);
transitionContextIn.setIntAttribute(TransitionContext.ATTR_DURATION, 1000);
transitionContextIn.setIntAttribute(TransitionContext.ATTR_DIRECTION, TransitionContext.DIRECTION_UP);
transitionContextOut = new TransitionContext(TransitionContext.TRANSITION_SLIDE);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_DURATION, 1000);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_DIRECTION, TransitionContext.DIRECTION_DOWN);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_KIND, TransitionContext.KIND_OUT);
engine.setTransition(null, screen, UiEngineInstance.TRIGGER_PUSH, transitionContextIn);
engine.setTransition(screen, null, UiEngineInstance.TRIGGER_POP, transitionContextOut);
break;
case FADE:
screen = new TransitionScreen("Fade", Color.TEAL);
transitionContextIn = new TransitionContext(TransitionContext.TRANSITION_FADE);
transitionContextIn.setIntAttribute(TransitionContext.ATTR_DURATION, 1000);
transitionContextOut = new TransitionContext(TransitionContext.TRANSITION_FADE);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_DURATION, 1000);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_KIND, TransitionContext.KIND_OUT);
engine.setTransition(null, screen, UiEngineInstance.TRIGGER_PUSH, transitionContextIn);
engine.setTransition(screen, null, UiEngineInstance.TRIGGER_POP, transitionContextOut);
break;
case WIPE:
screen = new TransitionScreen("Wipe", Color.LIGHTBLUE);
transitionContextIn = new TransitionContext(TransitionContext.TRANSITION_WIPE);
transitionContextIn.setIntAttribute(TransitionContext.ATTR_DURATION, 1000);
transitionContextIn.setIntAttribute(TransitionContext.ATTR_DIRECTION, TransitionContext.DIRECTION_LEFT);
transitionContextOut = new TransitionContext(TransitionContext.TRANSITION_WIPE);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_DURATION, 1000);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_DIRECTION, TransitionContext.DIRECTION_RIGHT);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_KIND, TransitionContext.KIND_OUT);
engine.setTransition(null, screen, UiEngineInstance.TRIGGER_PUSH, transitionContextIn);
engine.setTransition(screen, null, UiEngineInstance.TRIGGER_POP, transitionContextOut);
break;
case ZOOM:
screen = new TransitionScreen("Zoom", Color.LIGHTGREEN);
transitionContextIn = new TransitionContext(TransitionContext.TRANSITION_ZOOM);
transitionContextIn.setIntAttribute(TransitionContext.ATTR_DURATION, 1000);
transitionContextOut = new TransitionContext(TransitionContext.TRANSITION_ZOOM);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_DURATION, 1000);
transitionContextOut.setIntAttribute(TransitionContext.ATTR_KIND, TransitionContext.KIND_OUT);
engine.setTransition(null, screen, UiEngineInstance.TRIGGER_PUSH, transitionContextIn);
engine.setTransition(screen, null, UiEngineInstance.TRIGGER_POP, transitionContextOut);
break;
}
synchronized(UiApplication.getEventLock())
{
pushScreen(screen);
_pushed = true;
}
}
/**
* Causes this thread to pause between transitions
*/
private void snooze()
{
try
{
sleep(2000);
}
catch(Exception e)
{
System.out.println(e.toString());
}
}
}
}
TransitionScreen.java
/*
* TransitionScreen.java
*
* Copyright �1998-2010 Research In Motion Ltd.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.ui.screentransitionsdemo;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.ui.decor.*;
/**
* A screen to display a Bitmap in a BitmapField, used to demonstrate screen transitions
*/
public class TransitionScreen extends MainScreen
{
/**
* Creates a new TransitionScreen object
*/
public TransitionScreen(String title, int color)
{
setTitle(title);
VerticalFieldManager manager = (VerticalFieldManager)getMainManager();
manager.setBackground(BackgroundFactory.createSolidBackground(color));
}
/**
* @see Screen#invokeAction(int)
*/
protected boolean invokeAction(int action)
{
switch( action )
{
case ACTION_INVOKE:
{
ScreenTransitionsDemo app = (ScreenTransitionsDemo)UiApplication.getUiApplication();
app.startOrStopThread();
return true;
}
}
return super.invokeAction(action);
}
/**
* @see Screen#TouchEvent(TouchEvent)
*/
public boolean touchEvent(TouchEvent event)
{
if(event.getEvent() == TouchEvent.UNCLICK)
{
invokeAction(ACTION_INVOKE);
return true;
}
return super.touchEvent(event);
}
}
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