AG_Window object describes an Agar window, the base container for Agar widgets.
AG_Widget(3) objects form a tree structure attached to a parent
AG_Window. Agar windows are attached to some parent
AG_Driver(3) which provides a bridge between the Agar GUI system and the user's preferred
graphics platform / backend.
Widgets can be attached to the AG_Window object itself (it will behave like a standard, vertical AG_Box(3)). Agar's standard toolkit includes a variety of other container widgets, such as AG_Box(3), AG_Fixed(3), AG_Pane(3), AG_Notebook(3) and AG_Scrollview(3).
The dimensions of new Agar windows is best determined automatically (using recursive widget size requests which take resolution, font sizes, etc. into account). Agar widgets are expected to set a proper default size whenever it can be determined automatically, or otherwise provide a suitable application-level API for "size hints".
Newly created windows (as returned by AG_WindowNew()) must be made visible using AG_WindowShow().
Windows are destroyed by a single call to AG_ObjectDetach(3). The detach operation actually places the window on a queue, and actual freeing will occur after the end of the current event processing cycle. After a window has been successfully detached, the window-detached event is raised.
|AG_Object(3)-> AG_Widget(3)-> AG_Window.|
The AG_WindowNew() function creates a new Agar window using the default AG_Driver(3), returning a pointer to the newly created AG_Window or NULL on failure. If the default driver is a single-window driver, the new Agar window is attached to the AG_Driver object. If the default driver is a multiple-window driver, a new AG_Driver object instance is created for the new window. See the FLAGS section below for a description of the available flags options.
The AG_WindowNewNamed() variant creates an Agar window with a unique name identifier. If a window of the same name exists, AG_WindowNewNamed() only moves the focus to that window, and returns NULL. The name may contain any printable character, except " / ".
The AG_WindowNewSw() variant creates a new window and attaches it to the specified AG_DriverSw(3) object. This function is only useful to applications that wish to use multiple single-window drivers concurrently.
The AG_WindowSetCaption() function sets the text displayed by the titlebar (if there is one). If the string exceeds AG_LABEL_MAX bytes in length, it is truncated.
The AG_WindowSetIcon() function configures an alternate icon for the window. This icon will be used by Agar's internal window manager whenever the window is minimized. The given surface will be duplicated and rescaled if necessary. The AG_WindowSetIconNODUP() variant does not duplicate the provided surface, which must remain valid until the window is destroyed.
The AG_WindowSetCloseAction() function specifies the action to perform when the window is requested to be closed. Accepted arguments include:
To perform a different action, an event handler can be configured for the window-close and window-modal-close events (see the EVENTS section).
The AG_WindowSetPadding() function defines the space in pixels separating the widgets from the edges of the window.
The AG_WindowSetSpacing() function defines the space separating the widgets from each other. The default is 2 pixels.
Note that AG_WindowSetSpacing() only affects the widgets which are directly attached to the window. For widgets that are attached to container widgets, it is the container widgets that define spacing, as well as other aspects of widget organization. For instance, the AG_Box(3) container widget provides a AG_BoxSetSpacing() function .
AG_WindowSetSideBorders() sets the thickness of the left and right window borders in pixels. AG_WindowSetBottomBorder() sets the thickness of the bottom border. The exact interpretation of this setting is theme-specific. The default for side borders is 0 (no side borders). If the win argument is NULL, the defaults are set.
The AG_WindowSetPosition() function moves a window to a standard position, per the specified alignment. Possible values for the alignment argument are:
The special value AG_WINDOW_ALIGNMENT_NONE leaves the choice of the initial window position up to the underlying window manager (possibly Agar itself, or an external window manager).
If the tiling argument is 1, the AG_WINDOW_TILING flag is set (see FLAGS section). With tiling enabled, the window manager will attempt to avoid overlap between existing windows.
The AG_WindowSetGeometry() function moves/resizes a window to the specific position and geometry, given in pixels. If a value of -1 is passed for w or h, the window's default (or current) geometry is preserved.
The AG_WindowSetGeometryRect() variant of AG_WindowSetGeometry() accepts a AG_Rect(3) argument. The bounded argument specifies whether the window should be limited to the available view area.
The AG_WindowSetGeometryAligned() variant assigns the window a specific size in pixels and positions it according to the specified window alignment (see description of AG_WindowSetPosition() for the possible values). The parameters of AG_WindowSetGeometryAlignedPct() are given in percentage of current view area instead of pixels. Calling these functions with an argument of AG_WINDOW_ALIGNMENT_NONE is a no-op.
The AG_WindowSetGeometryBounded() variant limits the window to the view area (by default, windows can lie outside of the visible area).
The AG_WindowSetGeometryMax() variant sets the geometry to the size of the display (without setting the AG_WINDOW_MAXIMIZED flag).
The AG_WindowSetMinSize() routine sets the minimum window size in pixels. AG_WindowSetMinSizePct() sets the minimum window size in percentage of the requested (computed) size.
AG_WindowSetOpacity() configures an overall per-window opacity (for compositing window managers). The argument can range from 0.0 (transparent) to 1.0 (opaque).
For windows with the AG_WINDOW_FADEIN or AG_WINDOW_FADEOUT flags, AG_WindowSetFadeIn() and AG_WindowSetFadeOut() can be used to configure the fade timing parameters. During fade-in, the window opacity will be repeatedly incremented by fadeIncr, over a total period of fadeTime (in seconds).
The AG_WindowSetZoom() function sets the zoom level of the window. The AG_ZoomIn(), AG_ZoomOut() and AG_ZoomReset() functions set the zoom level for the currently focused window. It is customary to assign AG_GlobalKeys(3) shortcuts to these functions.
AG_WindowMaximize() and AG_WindowMinimize() maximizes and minimizes the window, respectively. AG_WindowUnmaximize() and AG_WindowUnminimize() does the opposite.
The AG_WindowAttach() function registers winChld as a child window dependent of winParent. Detaching the parent window (using AG_ObjectDetach(3)) will cause dependent child windows to be detached implicitely. Child windows also inherit the style properties from their parent. The AG_WindowDetach() function detaches the window from its parent window.
AG_WindowMakeTransient() registers winTrans as a dependent and transient window for winParent. The effects of transient window state are dependent on the underlying window system and window manager. Under Motif, transient windows have no titlebar buttons. Under TWM, transient windows are created without requesting that the user select an initial geometry. Detaching winParent (using AG_ObjectDetach(3)) will cause winTrans to be detached implicitely.
The AG_WindowPin() function "pins" winToPin to the parent window winParent. If the parent window is moved, the pinned window will be displaced along with it. AG_WindowUnpin() unpins the given window.
The AG_WindowUpdate() function updates the coordinates and geometries of all widgets attached to win. AG_WindowUpdate() should be called following AG_ObjectAttach(3) or AG_ObjectDetach(3) calls made in event context, or manual modifications of the x, y, w, h fields of the AG_Window structure. Note: In widget implementation code, one should use AG_WidgetUpdate(3) instead of this function.
DRIVER / EVENT LOOP INTERFACE
The following functions should be called only from application-specific
event loops, or low-level driver code.
AG_EventLoop(3) invokes them internally.
The AG_WindowDraw() function renders the specified window (by calling the renderWindow() operation of the associated AG_Driver(3)). Calls to AG_WindowDraw() must be made in GUI rendering context, between AG_BeginRendering(3) and AG_EndRendering(3).
AG_WindowDrawQueued() redraws any window marked as dirty since the last redraw.
The AG_WindowProcessQueued() routine processes any queued AG_ObjectDetach(3), AG_WindowShow(3) or AG_WindowHide(3) operation.
Newly created windows are invisible by default. The AG_WindowShow() function makes the specified window visible. AG_WindowHide() makes a window invisible.
Note that AG_WindowHide() only hides a window, without destroying its contents. To properly detach and free a window, AG_ObjectDetach(3) should be used.
AG_WindowIsVisible() returns the current visibility status of a window. A value of 0 means the window is invisible, 1 means it is visible.
The focus state controls the default filtering of events as well as the
behavior and cosmetic appearance of some widgets.
FOCUS STATE section of
AG_Widget(3) for details.
The AG_WindowFocus() function sets the focus on the given window. If the currently focused window has the AG_WINDOW_KEEPABOVE flag set, this function becomes a no-op. The focus change may not be immediate depending on the underlying graphics system. A window-gainfocus event is posted to the window object after the focus change has occured. If an argument of NULL is passed to AG_WindowFocus(), any planned change in focus is cancelled.
AG_WindowFocusNamed() calls AG_WindowFocus() on the window of the given name and returns 0 on success or -1 if the window was not found.
AG_WindowFocusAtPos() looks for a window at the specified coordinates in pixels, in the video display associated with the given single-display driver drv (see AG_DriverSw(3)). If a window is found, AG_WindowFocus() is called on it and 1 is returned. Otherwise, 0 is returned.
AG_WindowFindFocused() returns a pointer to the window currently holding input focus, or NULL if there are none. AG_WindowIsFocused() returns 1 if the window is currently holding focus, otherwise 0.
AG_WindowCycleFocus() places the focus over the widget following (or preceeding if reverse is 1) the widget currently holding focus inside of win. By default, Agar maps the "TAB" key to this function.
The AG_CloseFocusedWindow() routine requests closure of the currently focused window, if any.
WINDOW MANAGER HINTS
wmType field of
AG_Window hints at the function of the window.
This setting is used by underlying window managers to tweak window
appearance and behavior details.
The values correspond to those specified in Extended Window Manager Hints
(EWMH) version 1.4.
The GUI system may send
AG_Window objects the following events:
The following code fragment creates an Agar window containing a row of
The window will be positioned and dimensioned automatically:
The following code fragment creates an empty Agar window, centers it and sets an explicit size of 320x240:
|AG_Cursor(3), AG_Icon(3), AG_Intro(3), AG_View(3), AG_Widget(3)|
|The AG_Window system first appeared in Agar 1.0.|