net.miginfocom.layout
Interface ComponentWrapper

All Known Subinterfaces:

ContainerWrapper

All Known Implementing Classes:

SwingComponentWrapper, SwingContainerWrapper, SwtComponentWrapper, SwtContainerWrapper

public interface ComponentWrapper

A class that wraps the important parts of a Component.

NOTE!.equals() and .hashcode() should be shunted to the wrapped component. E.g.

        public int hashCode()
        {
                return getComponent().hashCode();
        }

        public final boolean equals(Object o)
        {
                 if (o instanceof ComponentWrapper == false)
                         return false;

                 return getComponent().equals(((ComponentWrapper) o).getComponent());
        }
 

Field Summary

static int	TYPE_BUTTON
static int	TYPE_CHECK_BOX
static int	TYPE_COMBO_BOX
static int	TYPE_CONTAINER
static int	TYPE_IMAGE
static int	TYPE_LABEL
static int	TYPE_LIST
static int	TYPE_PANEL
static int	TYPE_PROGRESS_BAR
static int	TYPE_SCROLL_BAR
static int	TYPE_SCROLL_PANE
static int	TYPE_SEPARATOR
static int	TYPE_SLIDER
static int	TYPE_SPINNER
static int	TYPE_TABLE
static int	TYPE_TEXT_AREA
static int	TYPE_TEXT_FIELD
static int	TYPE_TREE
static int	TYPE_UNKNOWN
static int	TYPE_UNSET

Method Summary

int	getBaseline(int width, int height) Returns the baseline for the component given the suggested height.
java.lang.Object	getComponent() Returns the actual object that this wrapper is aggregating.
int	getComponetType(boolean disregardScrollPane) Returns the type of component that this wrapper is wrapping.
int	getHeight() Returns the current height for this component.
int	getHorizontalScreenDPI() Returns the DPI (Dots Per Inch) of the screen the component is currently in or for the default screen if the component is not visible.
int	getLayoutHashCode() Returns a hash code that should be reasonably different for anything that might change the layout.
java.lang.String	getLinkId() Returns a String id that can be used to reference the component in link constraints.
int	getMaximumHeight(int wHint) Returns the maximum height of the component.
int	getMaximumWidth(int hHint) Returns the maximum width of the component.
int	getMinimumHeight(int wHint) Returns the minimum height of the component.
int	getMinimumWidth(int hHint) Returns the minimum width of the component.
ContainerWrapper	getParent() Returns the container for this component.
float	getPixelUnitFactor(boolean isHor) Returns the pixel unit factor for the horizontal or vertical dimension.
int	getPreferredHeight(int wHint) Returns the preferred height of the component.
int	getPreferredWidth(int hHint) Returns the preferred width of the component.
int	getScreenHeight() Returns the pixel size of the screen that the component is currently in or for the default screen if the component is not visible or null.
int	getScreenLocationX() Returns the screen x-coordinate for the upper left coordinate of the component layout-able bounds.
int	getScreenLocationY() Returns the screen y-coordinate for the upper left coordinate of the component layout-able bounds.
int	getScreenWidth() Returns the pixel size of the screen that the component is currently in or for the default screen if the component is not visible or null.
int	getVerticalScreenDPI() Returns the DPI (Dots Per Inch) of the screen the component is currently in or for the default screen if the component is not visible.
int[]	getVisualPadding() Returns the padding on a component by component basis.
int	getWidth() Returns the current width for this component.
int	getX() Returns the current x coordinate for this component.
int	getY() Returns the current y coordinate for this component.
boolean	hasBaseline() Returns if the component has a baseline and if it can be retrieved.
boolean	isVisible() Returns if the component's visibility is set to true.
void	paintDebugOutline() Paints component outline to indicate where it is.
void	setBounds(int x, int y, int width, int height) Sets the component's bounds.

Field Detail

TYPE_UNSET

static final int TYPE_UNSET

See Also:

Constant Field Values

TYPE_UNKNOWN

static final int TYPE_UNKNOWN

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Constant Field Values

TYPE_CONTAINER

static final int TYPE_CONTAINER

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TYPE_LABEL

static final int TYPE_LABEL

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Constant Field Values

TYPE_TEXT_FIELD

static final int TYPE_TEXT_FIELD

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TYPE_TEXT_AREA

static final int TYPE_TEXT_AREA

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Constant Field Values

TYPE_BUTTON

static final int TYPE_BUTTON

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Constant Field Values

TYPE_LIST

static final int TYPE_LIST

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Constant Field Values

TYPE_TABLE

static final int TYPE_TABLE

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Constant Field Values

TYPE_SCROLL_PANE

static final int TYPE_SCROLL_PANE

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Constant Field Values

TYPE_IMAGE

static final int TYPE_IMAGE

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Constant Field Values

TYPE_PANEL

static final int TYPE_PANEL

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Constant Field Values

TYPE_COMBO_BOX

static final int TYPE_COMBO_BOX

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Constant Field Values

TYPE_SLIDER

static final int TYPE_SLIDER

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TYPE_SPINNER

static final int TYPE_SPINNER

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TYPE_PROGRESS_BAR

static final int TYPE_PROGRESS_BAR

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TYPE_TREE

static final int TYPE_TREE

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Constant Field Values

TYPE_CHECK_BOX

static final int TYPE_CHECK_BOX

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Constant Field Values

TYPE_SCROLL_BAR

static final int TYPE_SCROLL_BAR

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TYPE_SEPARATOR

static final int TYPE_SEPARATOR

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Constant Field Values

Method Detail

getComponent

java.lang.Object getComponent()

Returns the actual object that this wrapper is aggregating. This might be needed for getting information about the object that the wrapper interface does not provide.

If this is a container the container should be returned instead.

Returns:

The actual object that this wrapper is aggregating. Not null.

getX

int getX()

Returns the current x coordinate for this component.

Returns:

The current x coordinate for this component.

getY

int getY()

Returns the current y coordinate for this component.

Returns:

The current y coordinate for this component.

getWidth

int getWidth()

Returns the current width for this component.

Returns:

The current width for this component.

getHeight

int getHeight()

Returns the current height for this component.

Returns:

The current height for this component.

getScreenLocationX

int getScreenLocationX()

Returns the screen x-coordinate for the upper left coordinate of the component layout-able bounds.

Returns:

The screen x-coordinate for the upper left coordinate of the component layout-able bounds.

getScreenLocationY

int getScreenLocationY()

Returns the screen y-coordinate for the upper left coordinate of the component layout-able bounds.

Returns:

The screen y-coordinate for the upper left coordinate of the component layout-able bounds.

getMinimumWidth

int getMinimumWidth(int hHint)

Returns the minimum width of the component.

Parameters:

hHint - The Size hint for the other dimension. An implementation can use this value or the current size for the widget in this dimension, or a combination of both, to calculate the correct size.
Use -1 to denote that there is no hint. This corresponds with SWT.DEFAULT.

Returns:

The minimum width of the component.

Since:

3.5. Added the hint as a parameter knowing that a correction and recompilation is necessary for any implementing classes. This change was worth it though.

getMinimumHeight

int getMinimumHeight(int wHint)

Returns the minimum height of the component.

Parameters:

wHint - The Size hint for the other dimension. An implementation can use this value or the current size for the widget in this dimension, or a combination of both, to calculate the correct size.
Use -1 to denote that there is no hint. This corresponds with SWT.DEFAULT.

Returns:

The minimum height of the component.

Since:

3.5. Added the hint as a parameter knowing that a correction and recompilation is necessary for any implementing classes. This change was worth it though.

getPreferredWidth

int getPreferredWidth(int hHint)

Returns the preferred width of the component.

Parameters:

hHint - The Size hint for the other dimension. An implementation can use this value or the current size for the widget in this dimension, or a combination of both, to calculate the correct size.
Use -1 to denote that there is no hint. This corresponds with SWT.DEFAULT.

Returns:

The preferred width of the component.

Since:

3.5. Added the hint as a parameter knowing that a correction and recompilation is necessary for any implementing classes. This change was worth it though.

getPreferredHeight

int getPreferredHeight(int wHint)

Returns the preferred height of the component.

Parameters:

wHint - The Size hint for the other dimension. An implementation can use this value or the current size for the widget in this dimension, or a combination of both, to calculate the correct size.
Use -1 to denote that there is no hint. This corresponds with SWT.DEFAULT.

Returns:

The preferred height of the component.

Since:

3.5. Added the hint as a parameter knowing that a correction and recompilation is necessary for any implementing classes. This change was worth it though.

getMaximumWidth

int getMaximumWidth(int hHint)

Returns the maximum width of the component.

Parameters:

hHint - The Size hint for the other dimension. An implementation can use this value or the current size for the widget in this dimension, or a combination of both, to calculate the correct size.
Use -1 to denote that there is no hint. This corresponds with SWT.DEFAULT.

Returns:

The maximum width of the component.

Since:

3.5. Added the hint as a parameter knowing that a correction and recompilation is necessary for any implementing classes. This change was worth it though.

getMaximumHeight

int getMaximumHeight(int wHint)

Returns the maximum height of the component.

Parameters:

wHint - The Size hint for the other dimension. An implementation can use this value or the current size for the widget in this dimension, or a combination of both, to calculate the correct size.
Use -1 to denote that there is no hint. This corresponds with SWT.DEFAULT.

Returns:

The maximum height of the component.

Since:

3.5. Added the hint as a parameter knowing that a correction and recompilation is necessary for any implementing classes. This change was worth it though.

setBounds

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

Sets the component's bounds.

Parameters:

x - The x coordinate.

y - The y coordinate.

width - The width.

height - The height.

isVisible

boolean isVisible()

Returns if the component's visibility is set to true. This should not return if the component is actually visible, but if the visibility is set to true or not.

Returns:

true means visible.

getBaseline

int getBaseline(int width,
                int height)

Returns the baseline for the component given the suggested height.

Parameters:

width - The width to calculate for if other than the current. If -1 the current size should be used.

height - The height to calculate for if other than the current. If -1 the current size should be used.

Returns:

The baseline from the top or -1 if not applicable.

hasBaseline

boolean hasBaseline()

Returns if the component has a baseline and if it can be retrieved. Should for instance return false for Swing before mustang.

Returns:

If the component has a baseline and if it can be retrieved.

getParent

ContainerWrapper getParent()

Returns the container for this component.

Returns:

The container for this component. Will return null if the component has no parent.

getPixelUnitFactor

float getPixelUnitFactor(boolean isHor)

Returns the pixel unit factor for the horizontal or vertical dimension.

The factor is 1 for both dimensions on the normal font in a JPanel on Windows. The factor should increase with a bigger "X".

This is the Swing version:

 Rectangle2D r = fm.getStringBounds("X", parent.getGraphics());
 wFactor = r.getWidth() / 6;
 hFactor = r.getHeight() / 13.27734375f;
 

Parameters:

isHor - If it is the horizontal factor that should be returned.

Returns:

The factor.

getHorizontalScreenDPI

int getHorizontalScreenDPI()

Returns the DPI (Dots Per Inch) of the screen the component is currently in or for the default screen if the component is not visible.

If headless mode PlatformDefaults.getDefaultDPI() will be returned.

Returns:

The DPI.

getVerticalScreenDPI

int getVerticalScreenDPI()

Returns the DPI (Dots Per Inch) of the screen the component is currently in or for the default screen if the component is not visible.

If headless mode PlatformDefaults.getDefaultDPI() will be returned.

Returns:

The DPI.

getScreenWidth

int getScreenWidth()

Returns the pixel size of the screen that the component is currently in or for the default screen if the component is not visible or null.

If in headless mode 1024 is returned.

Returns:

The screen size. E.g. 1280.

getScreenHeight

int getScreenHeight()

Returns the pixel size of the screen that the component is currently in or for the default screen if the component is not visible or null.

If in headless mode 768 is returned.

Returns:

The screen size. E.g. 1024.

getLinkId

java.lang.String getLinkId()

Returns a String id that can be used to reference the component in link constraints. This value should return the default id for the component. The id can be set for a component in the constraints and if so the value returned by this method will never be used. If there are no sensible id for the component null should be returned.

For instance the Swing implementation returns the string returned from Component.getName().

Returns:

The string link id or null.

getLayoutHashCode

int getLayoutHashCode()

Returns a hash code that should be reasonably different for anything that might change the layout. This value is used to know if the component layout needs to clear any caches.

Returns:

A hash code that should be reasonably different for anything that might change the layout. Returns -1 if the widget is disposed.

getVisualPadding

int[] getVisualPadding()

Returns the padding on a component by component basis. This method can be overridden to return padding to compensate for example for borders that have shadows or where the outer most pixel is not the visual "edge" to align to.

Default implementation returns null for all components except for Windows XP's JTabbedPane which will return new Insets(0, 0, 2, 2).

NOTE! To reduce generated garbage the returned padding should never be changed so that the same insets can be returned many times.

Returns:

null if no padding. NOTE! To reduce generated garbage the returned padding should never be changed so that the same insets can be returned many times. [top, left, bottom, right]

paintDebugOutline

void paintDebugOutline()

Paints component outline to indicate where it is.

getComponetType

int getComponetType(boolean disregardScrollPane)

Returns the type of component that this wrapper is wrapping.

This method can be invoked often so the result should be cached.

NOTE! This is misspelled. Keeping it that way though since this is only used by developers who port MigLayout.

Parameters:

disregardScrollPane - Is true any wrapping scroll pane should be disregarded and the type of the scrolled component should be returned.

Returns:

The type of component that this wrapper is wrapping. E.g. TYPE_LABEL.