| JWindow |
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typedict |
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A
JWindow
represents an undecorated top-level window that is implemented using the Java
Swing JWindow class.
A window consumes system resources that are currently only returned after
the window is explicitly disposed, which happens when your program stores
a non-zero value in the window's
dispose
field.
Yoix programs normally interact with a
JWindow
using event handlers and by reading or writing the following fields:
| autodispose |
An
int
that arranges to dispose the window,
exactly as if a non-zero value had been stored in the
dispose
field, whenever a visible window is hidden while
autodispose
is non-zero.
Failure to dispose of unused windows means system resources are lost,
and that can eventually affect the performance of your program.
| | autoraise |
An
int
that automatically puts the window on top of all other windows whenever
a non-zero value is stored in the window's
visible
field.
| | background |
The
Color
that is used to paint the background of the window.
It is also the default background color assigned to components in the
layout
array that do not pick their own.
A window that does not set its own background color uses
VM.screen.background.
Reading returns a snapshot of the current color.
Writing immediately sets the window's background,
and the background of components contained in the window
that do not pick their own, to the new color.
| | backgroundhints |
An
int
that controls how
backgroundimage
is displayed in the window.
The value should be one of
SCALE_AREA,
SCALE_DEFAULT,
SCALE_FAST,
SCALE_NONE,
SCALE_REPLICATE,
SCALE_SMOOTH,
or
SCALE_TILE,
which are all defined in
yoix.image.
SCALE_NONE
places the unscaled image in the upper left corner of the window,
while
SCALE_TILE
(the default) tiles the entire window with the unscaled image.
The other values select the algorithm used to scale
backgroundimage
so it fills the entire window.
Reading returns the current hints.
Writing immediately repaints the window using the new hints to
display the background image.
| | backgroundimage |
An
Object
that should be an
Image
or
String
that identifies an image that is automatically displayed as part of the
window's background in a way that is controlled by the value assigned to
backgroundhints.
A
NULL
value, which is the default, means there is no image.
A
backgroundimage
that is a
String
should name a local a file or URL that contains a GIF or JPEG image.
Reading returns the current image.
Writing immediately repaints the window using the new image.
| | border |
An
Object
that should be a
Border,
Insets,
Number,
or
String
that describes the border that is drawn around this window.
A
NULL
value, which is the default, means no border.
A
border
that is an
Insets
or
Number
is handled differently than most other Swing components,
because it is used, in combination with the
insets
field, to set the extent of the highlighted border,
in units of 72 dots per inch, that is drawn around the window.
A
border
that is a
String
is a quick way to surround this window with a border that uses the
String
as its title.
Reading returns a snapshot of the current border.
Writing immediately sets the window's border to the new value.
| | components |
A
Dictionary
maintained by the interpreter's layout machinery that maps
tag
fields to actual components;
every component contained in the window has an entry in the dictionary.
In addition, the
root
field in each component is automatically set to the window, so the
components
dictionary is easy to find, and that means individual components
can find each other by name using the
root.components
dictionary.
| | cursor |
An
Object
that should be an
int,
Image,
or
String
that selects the cursor shown when the pointer is over the window.
It is also the default cursor assigned to components in the window's
layout
array that do not pick their own.
A
cursor
that is an
int
should be one of the cursors defined in the
yoix.awt.Cursor
dictionary.
A
cursor
that is an
Image
can describe the cursor using its
size
and
hotspot
fields and often draws it using its
paint
function.
A
cursor
that is a
String
should be the name of a cursor that is already defined in
yoix.awt.Cursor
or the name a local a file or URL that contains a GIF or JPEG image
that will be used as the cursor.
Reading returns the current cursor.
Writing immediately sets the window's cursor,
and the cursor of components contained in the window
that do not pick their own, to the new value.
A window that does not set its own cursor uses
DEFAULT_CURSOR.
| | dispose |
An
int
that is
1
when the window has been properly disposed and
0
otherwise.
Reading returns the current dispose state.
Writing a non-zero value
immediately disposes the window;
writing
0
has no effect, which means you cannot
resurrect a disposed window.
Failure to dispose of unused windows means system resources are lost,
and that can eventually affect the performance of your program.
| | doublebuffered |
An
int
that is
1
(the default)
when the window uses double-buffering to draw itself and
0
when it does not.
Reading returns the current double-buffering behavior.
Writing immediately sets the window's double-buffering behavior to the new value.
Note that double-buffering may be required when transparent components are used.
In addition, components contained in a window that is using double-buffering
may be using that buffer even when they explicitly disable double-buffering.
| | dragenabled |
An
int
that should be set to
1
when this window wants to use the automatic drag handling that Swing provides
for some components, and
0
(the default)
when it does not.
Components that do not provide automatic drag handling always return
0
when their
dragenabled
field is read, so storing
1
in
dragenabled
should only be viewed as a request for a service that may not be available.
Swing components can always take complete control of their drag and drop
handling using their
transferhandler
field or special drag and drop event handlers.
| | enabled |
An
int
that is
1
when the window,
or any of the components contained in the window,
can respond to user input, and
0
when they can not.
Reading returns the current state.
Writing immediately sets the window's state to the new value.
| | focusowner |
A read-only
int
that is non-zero when the window has the focus.
| | font |
The
Font,
or font name if it is a
String,
that is used as the default font assigned to components in the
layout
array that do not pick their own.
Reading returns a snapshot of the current font.
Writing immediately changes the window's font,
and the font used by all components contained in the window
that do not pick their own, to the new font.
| | foreground |
The
Color
that is used as the default foreground color assigned to components in the
layout
array that do not pick their own.
A window that does not set its own foreground color uses
VM.screen.foreground.
Reading returns a snapshot of the current color.
Writing immediately sets the window's foreground,
and the foreground of components contained in the window
that do not pick their own, to the new color.
| | fronttoback |
An
int
that is
1
when components that appear earlier in the
layout
array are placed on top of components that appear later, and
0
when the stacking order is reversed.
In practice,
GridBagLayout
and
CardLayout
are only layout managers where stacking components makes sense.
Reading returns the current stacking order.
Writing immediately tries to change the stacking order.
| | glasspane |
A Swing component, often a
JCanvas
or
JPanel,
that completely covers the window when its visible
field is non-zero and is hidden otherwise.
The component is transparent unless its opaque field is non-zero.
Reading returns the current
glasspane,
which is
NULL
by default.
Writing immediately changes the component the window is using as its
glasspane.
In the current implementation the
root
field in
glasspane
does not point to the window, but that may change in a future release.
| | graphics |
A
Graphics
object that defines properties and built-ins that are used to apply
graphics operations to this window.
Writing after a window has been created is not allowed and will result in an
invalidaccess
error.
| | layout |
An
Array
of objects, often just components, that the
layoutmanager
arranges in the window.
Reading returns the current array.
Writing immediately clears window and then arranges the new
set of components in the window.
| | layoutmanager |
A
LayoutManager
that takes components from the
layout
array, arranges them in the window, updates the window's
components
dictionary, and makes sure the
root
field in each component is set to the window.
Reading returns the current layout manager.
Writing, when
validate
is non-zero, immediately clears the window and then rearranges
the components in the
layout
array using the new layout manager.
Yoix windows use a
BorderLayout
as their default layout manager.
| | location |
A
Point
that determines the location of the window's upper left corner
in the default Yoix coordinate system,
which has its origin at the upper left corner of the screen,
positive x to the right, positive y down, and a resolution of
72 dots per inch.
Reading returns a snapshot of the current location.
Writing immediately moves the window to the new location.
| | nextcard |
An
Object
that
CardLayout
layout managers use to pick the next component that is displayed in the
window.
See the description of
CardLayout
for more details.
| | opaque |
An
int
that should be
0
or
1
(the default) that is only used as the final default value for components
contained in the window that do not explicitly set their
opaque
field to something other than
NULL.
Changing a window's
opaque
field does not affect the background of the window itself, but it
can immediately change the appearance of the components contained
in the window.
| | paint([Rectangle rect]) |
A
Function
that is called, if it is not
NULL,
whenever the window needs to be painted.
The optional
rect
argument describes the rectangle that needs repainting in the
coordinate system specified by
graphics.CTM,
which by default has its origin at the window's upper left corner,
positive x to the right, positive y down, and a resolution of 72 dots per inch.
| | parent |
A window, which usually should be a
JFrame,
JDialog,
JFileDialog,
JWindow,
or
JInternalFrame,
that is responsible for the window.
Hiding, disposing, iconifying or deiconifying the parent does the same
thing to its children, so using a parent is a convenient way to manage
a group of windows.
Reading returns the current parent.
Writing immediately sets the window's parent to the new value.
| | popup |
A
JPopupMenu
that is associated with the window.
Reading returns the current popup menu.
Writing immediately shows the popup menu at the point in the window's coordinate
system specified by the popup menu's
location
field, assuming of course that the window is showing on the screen.
Storing
TRUE
in the popup menu's
visible
field, which was added in release 1.2.0, is an easy way to show the
popup menu that currently belongs to the window.
| | repaint() |
A
Builtin
that tells the window to completely repaint itself,
which means the background is regenerated and then the window's
paint
function is called.
Obviously
repaint
should not be called, either directly or indirectly, from the window's
paint
function, however
erasedrawable
is safe because it does not trigger a
paint
call.
| | requestfocus |
An
int
that can be used to request or transfer the keyboard focus.
Storing a non-zero value in
requestfocus
tries to get the focus.
Storing
0
tries to transfer the focus.
Reading
requestfocus
does not currently return any useful information.
| | root |
A read-only field that for convenience always points to the window itself.
| | showing |
A read-only
int
that is non-zero when the window is showing on the screen.
Reading
showing
or
visible
produce identical results for a top-level container like a window.
| | size |
A
Dimension
that determines the size of the window
in units of 72 dots per inch.
Reading returns a snapshot of the current size.
Writing immediately changes the window's size to the new value.
Setting
size
to
NULL
means the
layoutmanager
determines the size of the window based on the preferred size
of the components in the
layout
array.
| | tag |
A
String
used to identify the window that is either supplied when
the window is declared, or automatically generated otherwise.
JWindow are top-level containers, so the
tag
field is not particularly useful and may be deleted in future releases.
| | title |
A
String
that is used as the window's title.
Reading returns a snapshot of the current title.
Writing immediately changes the title to the new value.
| | tooltiptext |
A
String
of characters that is displayed in a tightly sized pop-up window that
appears near the cursor whenever the cursor lingers over the window.
Setting this value to
NULL
(the default)
disables the tooltip mechanism.
Reading returns the current tooltip text.
Writing immediately sets the new tooltip text.
| | validate |
An
int
that is
1
when changing the
layoutmanager
field takes effect immediately, and
0
when the change is delayed, often until after the
layout,
size,
or
validate
fields change.
Storing a
1
in
validate
always runs Java's layout manager, even when nothing has changed.
| | visible |
An
int
that is
1
when the window is visible, and
0
otherwise.
Reading returns the current visibility.
Writing immediately sets the window's visibility to the new state.
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Several permanent fields have not been documented and should not be
used in Yoix applications.
Event handlers are functions that must be added to a window when it is
declared.
The handlers that work with windows are listed below;
the names should be familiar if you have done some Java programming.
The
actionPerformed
and
itemStateChanged
event handlers are only for menus.
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| Event Handlers: |
actionPerformed,
componentHidden,
componentMoved,
componentResized,
componentShown,
dragDropEnd,
dragEnter,
dragExit,
dragGestureRecognized,
dragMouseMoved,
dragOver,
drop,
dropActionChanged,
focusGained,
focusLost,
invocationRun,
itemStateChanged,
keyPressed,
keyReleased,
keyTyped,
mouseClicked,
mouseDragged,
mouseEntered,
mouseExited,
mouseMoved,
mousePressed,
mouseReleased,
mouseWheelMoved,
windowActivated,
windowClosed,
windowClosing,
windowDeactivated,
windowDeiconified,
windowIconified,
windowOpened
| | |
| Example: |
The program,
import yoix.*.*;
Array labels = {"One", "Two", "Hello, World", "Exit"};
ActionPerformed(e) {
printf("Label=%s\n", this.text);
if (strcmp(this.text, "Exit") == 0)
exit(0);
};
ButtonPanel() {
Array buttons[labels@length];
int n;
for (n = 0; n < labels@sizeof; n++) {
buttons[n] = new JButton {
String text = labels[n];
Function actionPerformed = ActionPerformed;
};
}
return(
new JPanel {
GridLayout layoutmanager = {
int rows = 0;
int columns = 1;
};
Array layout = buttons;
}
);
}
JWindow buttonmenu = {
Dimension size = NULL;
Array layout = {ButtonPanel()};
int cursor = Cursor.HAND_CURSOR;
};
buttonmenu.visible = TRUE;
uses a window to build something that looks like a menu of
buttons.
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| See Also: |
BorderLayout,
BoxLayout,
CardLayout,
CustomLayout,
FlowLayout,
GridBagLayout,
GridLayout,
invokeLater,
JButton,
JCanvas,
JCheckBox,
JCheckBoxMenuItem,
JChoice,
JColorChooser,
JComboBox,
JDesktopPane,
JDialog,
JFileChooser,
JFileDialog,
JFrame,
JInternalFrame,
JLabel,
JLayeredPane,
JList,
JMenu,
JMenuBar,
JMenuItem,
JPanel,
JPasswordField,
JPopupMenu,
JProgressBar,
JRadioButton,
JRadioButtonMenuItem,
JScrollBar,
JScrollPane,
JSeparator,
JSlider,
JSplitPane,
JTabbedPane,
JTable,
JTextArea,
JTextCanvas,
JTextField,
JTextPane,
JTextTerm,
JToggleButton,
JToolBar,
JTree,
LayoutManager,
postEvent,
toBack,
toFront
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Yoix is a registered trademark of AT&T Intellectual Property.
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