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processing/app/src/processing/app/ui/SplashWindow.java at master · hayscoding/processing · GitHub
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processing
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ui
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SplashWindow.java
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processing
/
app
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src
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processing
/
app
/
ui
/
SplashWindow.java
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package
processing
.
app
.
ui
;
/*
* @(#)SplashWindow.java 2.2.1 2006-05-27
*
* Copyright (c) 2003-2010 Werner Randelshofer
* Hausmatt 10, Immensee, CH-6405, Switzerland.
*
* This software is in the public domain.
* You are free to use, adapt, copy and license this work
* without having to attribute to Werner Randelshofer.
*/
import
java
.
awt
.
EventQueue
;
import
java
.
awt
.
Frame
;
import
java
.
awt
.
Graphics
;
import
java
.
awt
.
Image
;
import
java
.
awt
.
MediaTracker
;
import
java
.
awt
.
Toolkit
;
import
java
.
awt
.
Window
;
import
java
.
awt
.
event
.
MouseAdapter
;
import
java
.
awt
.
event
.
MouseEvent
;
import
java
.
net
.
URL
;
/**
* A Splash window.
* <p>
* Usage: MyApplication is your application class. Create a Splasher class which
* opens the splash window, invokes the main method of your Application class,
* and disposes the splash window afterwards.
* Please note that we want to keep the Splasher class and the SplashWindow class
* as small as possible. The less code and the less classes must be loaded into
* the JVM to open the splash screen, the faster it will appear.
* <pre>
* class Splasher {
* public static void main(String[] args) {
* SplashWindow.splash(Startup.class.getResource("splash.gif"));
* MyApplication.main(args);
* SplashWindow.disposeSplash();
* }
* }
* </pre>
*
* @author Werner Randelshofer
* @version 2.2.1 2006-05-27 Abort when splash image can not be loaded.
*/
public
class
SplashWindow
extends
Window
{
/**
* The current instance of the splash window.
* (Singleton design pattern).
*/
private
static
SplashWindow
instance
;
/**
* The splash image which is displayed on the splash window.
*/
private
Image
image
;
/**
* This attribute indicates whether the method
* paint(Graphics) has been called at least once since the
* construction of this window.<br>
* This attribute is used to notify method splash(Image)
* that the window has been drawn at least once
* by the AWT event dispatcher thread.<br>
* This attribute acts like a latch. Once set to true,
* it will never be changed back to false again.
*
* @see #paint
* @see #splash
*/
private
boolean
paintCalled
=
false
;
/**
* Creates a new instance.
* @param parent the parent of the window.
* @param image the splash image.
*/
private
SplashWindow
(
Frame
parent
,
Image
image
,
boolean
hidpi
) {
super
(
parent
);
this
.
image
=
image
;
// Load the image
MediaTracker
mt
=
new
MediaTracker
(
this
);
mt
.
addImage
(
image
,
0
);
try
{
mt
.
waitForID
(
0
);
}
catch
(
InterruptedException
ie
){}
// Abort on failure
if
(
mt
.
isErrorID
(
0
)) {
setSize
(
0
,
0
);
System
.
err
.
println
(
"Warning: SplashWindow couldn't load splash image."
);
synchronized
(
this
) {
paintCalled
=
true
;
notifyAll
();
}
return
;
}
// Center the window on the screen
int
imgWidth
=
image
.
getWidth
(
this
);
int
imgHeight
=
image
.
getHeight
(
this
);
if
(
hidpi
) {
imgWidth
/=
2
;
imgHeight
/=
2
;
}
setSize
(
imgWidth
,
imgHeight
);
// Dimension screenDim = Toolkit.getDefaultToolkit().getScreenSize();
// setLocation((screenDim.width - imgWidth) / 2,
// (screenDim.height - imgHeight) / 2);
setLocationRelativeTo
(
null
);
// Users shall be able to close the splash window by
// clicking on its display area. This mouse listener
// listens for mouse clicks and disposes the splash window.
MouseAdapter
disposeOnClick
=
new
MouseAdapter
() {
public
void
mouseClicked
(
MouseEvent
evt
) {
// Note: To avoid that method splash hangs, we
// must set paintCalled to true and call notifyAll.
// This is necessary because the mouse click may
// occur before the contents of the window
// has been painted.
synchronized
(
SplashWindow
.
this
) {
SplashWindow
.
this
.
paintCalled
=
true
;
SplashWindow
.
this
.
notifyAll
();
}
dispose
();
}
};
addMouseListener
(
disposeOnClick
);
}
/**
* Updates the display area of the window.
*/
public
void
update
(
Graphics
g
) {
// Note: Since the paint method is going to draw an
// image that covers the complete area of the component we
// do not fill the component with its background color
// here. This avoids flickering.
paint
(
g
);
}
/**
* Paints the image on the window.
*/
public
void
paint
(
Graphics
g
) {
g
.
drawImage
(
image
,
0
,
0
,
getWidth
(),
getHeight
(),
this
);
// Notify method splash that the window
// has been painted.
// Note: To improve performance we do not enter
// the synchronized block unless we have to.
if
(!
paintCalled
) {
paintCalled
=
true
;
synchronized
(
this
) {
notifyAll
(); }
}
}
/**
* Open's a splash window using the specified image.
* @param image The splash image.
*/
public
static
void
splash
(
Image
image
,
boolean
hidpi
) {
if
(
instance
==
null
&&
image
!=
null
) {
Frame
f
=
new
Frame
();
// Create the splash image
instance
=
new
SplashWindow
(
f
,
image
,
hidpi
);
// Show the window.
instance
.
setVisible
(
true
);
// Note: To make sure the user gets a chance to see the
// splash window we wait until its paint method has been
// called at least once by the AWT event dispatcher thread.
// If more than one processor is available, we don't wait,
// and maximize CPU throughput instead.
if
(!
EventQueue
.
isDispatchThread
()
&&
Runtime
.
getRuntime
().
availableProcessors
() ==
1
) {
synchronized
(
instance
) {
while
(!
instance
.
paintCalled
) {
try
{
instance
.
wait
(); }
catch
(
InterruptedException
e
) {}
}
}
}
}
}
/**
* Open's a splash window using the specified image.
* @param imageURL The url of the splash image.
*/
public
static
void
splash
(
URL
imageURL
,
boolean
hidpi
) {
if
(
imageURL
!=
null
) {
splash
(
Toolkit
.
getDefaultToolkit
().
createImage
(
imageURL
),
hidpi
);
}
}
/**
* Closes the splash window.
*/
public
static
void
disposeSplash
() {
if
(
instance
!=
null
) {
instance
.
getOwner
().
dispose
();
instance
=
null
;
}
}
/**
* Invokes the main method of the provided class name.
* @param args the command line arguments
*/
public
static
void
invokeMain
(
String
className
,
String
[]
args
) {
try
{
Class
.
forName
(
className
)
.
getMethod
(
"main"
,
new
Class
[] {
String
[].
class
})
.
invoke
(
null
,
new
Object
[] {
args
});
}
catch
(
Exception
e
) {
InternalError
error
=
new
InternalError
(
"Failed to invoke main method"
);
error
.
initCause
(
e
);
throw
error
;
}
}
}
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