Class QtComponentPeer

protected static final int POPUP_TRIGGER

Popup trigger button, may differ between platforms

Field Value:

3

protected QtImage backBuffer

The component's double buffer for off-screen drawing.

protected long qtApp

protected QtToolkit toolkit

The toolkit which manufactured this peer.

protected void callInit()

public boolean canDetermineObscurity()

Returns true if this component peer can determine if the component has been obscured, false otherwise.

Specified by:

canDetermineObscurity in interface ComponentPeer

Returns:

true if this component peer can determine if the component has been obscured, false otherwise

public int checkImage(Image img,
                      int w,
                      int h,
                      ImageObserver o)

Returns the construction status of the specified image. This is called by Component.checkImage(Image,int,int,ImageObserver).

Specified by:

checkImage in interface ComponentPeer

Parameters:

img - the image

Returns:

a bitwise ORed set of ImageObserver flags

protected void closeEvent()

Window closing event

public void coalescePaintEvent(PaintEvent e)

Coalesces the specified paint event.

Specified by:

coalescePaintEvent in interface ComponentPeer

Parameters:

e - the paint event

public void createBuffers(int numBuffers,
                          BufferCapabilities caps)
            throws AWTException

Create a number of image buffers that implement a buffering strategy according to the given capabilities.

Specified by:

createBuffers in interface ComponentPeer

Parameters:

numBuffers - the number of buffers

caps - the buffering capabilities

Throws:

AWTException - if the specified buffering strategy is not implemented

Since:

1.2

public Image createImage(int width,
                         int height)

Creates an empty image with the specified width and height.

Specified by:

createImage in interface ComponentPeer

Parameters:

width - the width of the image to be created

height - the height of the image to be created

Returns:

the created image

public Image createImage(ImageProducer producer)

Creates an image by starting the specified image producer. This is called by Component.createImage(ImageProducer).

Specified by:

createImage in interface ComponentPeer

Parameters:

Returns:

the created image

public VolatileImage createVolatileImage(int w,
                                         int h)

A convenience method that creates a volatile image. The volatile image is created on the screen device on which this component is displayed, in the device's current graphics configuration.

Specified by:

createVolatileImage in interface ComponentPeer

Parameters:

Since:

1.2

See Also:

VolatileImage

public void destroyBuffers()

Destroy the resources created by createBuffers.

Specified by:

destroyBuffers in interface ComponentPeer

Since:

1.2

public void disable()

Disables the component. This is called by Component.disable().

Specified by:

disable in interface ComponentPeer

public void dispose()

Disposes the component peer. This should release all resources held by the peer. This is called when the component is no longer in use.

Specified by:

dispose in interface ComponentPeer

public void enable()

Enables the component. This is called by Component.enable().

Specified by:

enable in interface ComponentPeer

protected void enterEvent(int modifiers,
                          int x,
                          int y,
                          int dummy)

public void finalize()

Called on an object by the Virtual Machine at most once, at some point after the Object is determined unreachable but before it is destroyed. You would think that this means it eventually is called on every Object, but this is not necessarily the case. If execution terminates abnormally, garbage collection does not always happen. Thus you cannot rely on this method to always work. For finer control over garbage collection, use references from the java.lang.ref package.

Virtual Machines are free to not call this method if they can determine that it does nothing important; for example, if your class extends Object and overrides finalize to do simply super.finalize().

finalize() will be called by a Thread that has no locks on any Objects, and may be called concurrently. There are no guarantees on the order in which multiple objects are finalized. This means that finalize() is usually unsuited for performing actions that must be thread-safe, and that your implementation must be use defensive programming if it is to always work.

If an Exception is thrown from finalize() during garbage collection, it will be patently ignored and the Object will still be destroyed.

It is allowed, although not typical, for user code to call finalize() directly. User invocation does not affect whether automatic invocation will occur. It is also permitted, although not recommended, for a finalize() method to "revive" an object by making it reachable from normal code again.

Unlike constructors, finalize() does not get called for an object's superclass unless the implementation specifically calls super.finalize().

The default implementation does nothing.

Overrides:

finalize in interface Object

See Also:

System.gc(), System.runFinalizersOnExit(boolean), java.lang.ref

public void flip(BufferCapabilities.FlipContents contents)

Perform a page flip, leaving the contents of the back buffer in the specified state.

Specified by:

flip in interface ComponentPeer

Parameters:

contents - the state in which to leave the back buffer

Since:

1.2

protected void focusInEvent()

protected void focusOutEvent()

public Image getBackBuffer()

Return the back buffer of this component.

Specified by:

getBackBuffer in interface ComponentPeer

Returns:

the back buffer of this component.

Since:

1.2

public Rectangle getBounds()

Get the bounds of this component peer.

Specified by:

getBounds in interface ComponentPeer

Returns:

component peer bounds

Since:

1.5

public ColorModel getColorModel()

Returns the color model of the component. This is currently not used.

Specified by:

getColorModel in interface ComponentPeer

Returns:

the color model of the component

public FontMetrics getFontMetrics(Font font)

Returns the font metrics for the specified font. This is called by Component.getFontMetrics(Font).

Specified by:

getFontMetrics in interface ComponentPeer

Parameters:

Returns:

the font metrics for the specified font

public Graphics getGraphics()

Returns a Graphics object suitable for drawing on this component. This is called by Component.getGraphics().

Specified by:

getGraphics in interface ComponentPeer

Returns:

a graphics object suitable for drawing on this component

public GraphicsConfiguration getGraphicsConfiguration()

Get the graphics configuration of the component. The color model of the component can be derived from the configuration.

Specified by:

getGraphicsConfiguration in interface ComponentPeer

Returns:

the graphics configuration of the component

public Point getLocationOnScreen()

Returns the location of this component in screen coordinates. This is called by Component.getLocationOnScreen().

Specified by:

getLocationOnScreen in interface ComponentPeer

Returns:

the location of this component in screen coordinates

public Dimension getMinimumSize()

Returns the minimum size for the component. This is called by Component.getMinimumSize().

Specified by:

getMinimumSize in interface ComponentPeer

Returns:

the minimum size for the component

public Dimension getPreferredSize()

Returns the preferred size for the component. This is called by Component.getPreferredSize().

Specified by:

getPreferredSize in interface ComponentPeer

Returns:

the preferred size for the component

public Toolkit getToolkit()

Returns the toolkit that created this peer.

Specified by:

getToolkit in interface ComponentPeer

Returns:

the toolkit that created this peer

public void handleEvent(AWTEvent e)

Handles the given event. This is called from Component.dispatchEvent(AWTEvent) to give the peer a chance to react to events for the component.

Specified by:

handleEvent in interface ComponentPeer

Parameters:

e - the event

public boolean handlesWheelScrolling()

Returns true, if this component can handle wheel scrolling, false otherwise.

Specified by:

handlesWheelScrolling in interface ComponentPeer

Returns:

true, if this component can handle wheel scrolling, false otherwise

public void hide()

Makes the component invisible. This is called from Component.hide().

Specified by:

hide in interface ComponentPeer

protected void hideEvent()

protected void init()

Init does the creation of native widgets, it is therefore called from the main thread. (the constructor waits for this to happen.)

public boolean isFocusTraversable()

Returns true if the component can receive keyboard input focus. This is called from Component.isFocusTraversable().

Specified by:

isFocusTraversable in interface ComponentPeer

public boolean isFocusable()

Returns true if the component can receive keyboard input focus. This is called from Component.isFocusable().

Specified by:

isFocusable in interface ComponentPeer

public boolean isObscured()

Returns true if this component has been obscured, false otherwise. This will only work if ComponentPeer.canDetermineObscurity() also returns true.

Specified by:

isObscured in interface ComponentPeer

Returns:

true if this component has been obscured, false otherwise.

public boolean isReparentSupported()

Check if this component supports being reparented.

Specified by:

isReparentSupported in interface ComponentPeer

Returns:

true if this component can be reparented, false otherwise.

Since:

1.5

protected void keyPressEvent(int modifiers,
                             int code,
                             int unicode,
                             int dummy)

protected void keyReleaseEvent(int modifiers,
                               int code,
                               int unicode,
                               int dummy)

public void layout()

Layout this component peer.

Specified by:

layout in interface ComponentPeer

Since:

1.5

protected void leaveEvent(int modifiers,
                          int x,
                          int y,
                          int dummy)

public Dimension minimumSize()

Returns the minimum size for the component. This is called by Component.minimumSize().

Specified by:

minimumSize in interface ComponentPeer

Returns:

the minimum size for the component

protected void mouseDoubleClickEvent(int modifiers,
                                     int x,
                                     int y,
                                     int clickCount)

protected void mouseMoveEvent(int modifiers,
                              int x,
                              int y,
                              int clickCount)

protected void mousePressEvent(int modifiers,
                               int x,
                               int y,
                               int clickCount)

protected void mouseReleaseEvent(int modifiers,
                                 int x,
                                 int y,
                                 int clickCount)

protected void moveEvent(int x,
                         int y,
                         int oldx,
                         int oldy)

public void paint(Graphics g)

paint() is called back from the native side in response to a native repaint event.

Specified by:

paint in interface ComponentPeer

public void paintBackBuffer()
            throws InterruptedException

public void paintBackBuffer(int x,
                            int y,
                            int w,
                            int h)
            throws InterruptedException

public Dimension preferredSize()

Returns the preferred size for the component. This is called by Component.getPreferredSize().

Specified by:

preferredSize in interface ComponentPeer

Returns:

the preferred size for the component

public boolean prepareImage(Image img,
                            int w,
                            int h,
                            ImageObserver o)

Prepares an image for rendering on this component. This is called by Component.prepareImage(Image,int,int,ImageObserver).

Specified by:

prepareImage in interface ComponentPeer

Parameters:

img - the image to prepare

Returns:

true if the image has been fully prepared, false otherwise (in which case the image observer receives updates)

public void print(Graphics g)

Specified by:

print in interface ComponentPeer

public void repaint(long tm,
                    int x,
                    int y,
                    int w,
                    int h)

Schedules a timed repaint.

Specified by:

repaint in interface ComponentPeer

public void reparent(ContainerPeer parent)

Reparent this component under another container.

Specified by:

reparent in interface ComponentPeer

Parameters:

parent -

Since:

1.5

public void requestFocus()

Requests that this component receives the focus. This is called from Component.requestFocus().

Specified by:

requestFocus in interface ComponentPeer

public boolean requestFocus(Component source,
                            boolean bool1,
                            boolean bool2,
                            long x)

Requests that this component receives the focus. This is called from Component.requestFocus(). This method is only called for heavyweight component's peers. Lightweight components ask their nearest heavyweight component to request focus. It's up to the heavyweight peer to decide if any of it's lightweight descendants are allowed to receive keyboard input focus or not. If the focus request is finally approved, then the peer must post a FOCUS_GAINED event for the requested component.

Specified by:

requestFocus in interface ComponentPeer

Parameters:

public boolean requestFocus(Component lightweightChild,
                            boolean temporary,
                            boolean focusedWindowChangeAllowed,
                            long time,
                            CausedFocusEvent.Cause cause)

Requests the focus on the component.

Specified by:

requestFocus in interface ComponentPeer

public void reshape(int x,
                    int y,
                    int width,
                    int height)

Notifies the peer that the bounds of this component have changed. This is called by Component.reshape(int,int,int,int).

Specified by:

reshape in interface ComponentPeer

Parameters:

x - the X coordinate of the upper left corner of the component

y - the Y coordinate of the upper left corner of the component

width - the width of the component

height - the height of the component

protected void resizeEvent(int oldWidth,
                           int oldHeight,
                           int width,
                           int height)

public void setBackground(Color c)

Sets the background color of the component. This is called by Component.setBackground(Color).

Specified by:

setBackground in interface ComponentPeer

Parameters:

public void setBounds(int x,
                      int y,
                      int width,
                      int height)

Notifies the peer that the bounds of this component have changed. This is called by Component.setBounds(int,int,int,int).

Specified by:

setBounds in interface ComponentPeer

Parameters:

x - the X coordinate of the upper left corner of the component

y - the Y coordinate of the upper left corner of the component

width - the width of the component

height - the height of the component

public void setBounds(int x,
                      int y,
                      int width,
                      int height,
                      int z)

Set the bounds of this component peer.

Specified by:

setBounds in interface ComponentPeer

Parameters:

x - the new x co-ordinate

y - the new y co-ordinate

width - the new width

height - the new height

z - the new stacking level

Since:

1.5

public void setCursor(Cursor cursor)

Sets the cursor of the component. This is called by Component.setCursor(Cursor).

Specified by:

setCursor in interface ComponentPeer

public void setEnabled(boolean b)

Sets the enabled/disabled state of this component. This is called by Component.setEnabled(boolean).

Specified by:

setEnabled in interface ComponentPeer

Parameters:

public void setEventMask(long x)

Classpath-specific method

Specified by:

setEventMask in interface ComponentPeer

public void setFont(Font f)

Sets the font of the component. This is called by Component.setFont(Font).

Specified by:

setFont in interface ComponentPeer

Parameters:

public void setForeground(Color c)

Sets the foreground color of the component. This is called by Component.setForeground(Color).

Specified by:

setForeground in interface ComponentPeer

Parameters:

public void setVisible(boolean b)

Sets the visibility state of the component. This is called by Component.setVisible(boolean).

Specified by:

setVisible in interface ComponentPeer

Parameters:

protected void setup()

public void show()

Makes the component visible. This is called by Component.show().

Specified by:

show in interface ComponentPeer

protected void showEvent()

public void updateCursorImmediately()

Update the cursor (note that setCursor is usually not called)

Specified by:

updateCursorImmediately in interface ComponentPeer