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GtkLayout

GtkLayout — Infinite scrollable area containing child widgets and/or custom drawing

Synopsis


#include <gtk/gtk.h>


            GtkLayout;
GtkWidget*  gtk_layout_new                  (GtkAdjustment *hadjustment,
                                             GtkAdjustment *vadjustment);
void        gtk_layout_put                  (GtkLayout *layout,
                                             GtkWidget *child_widget,
                                             gint x,
                                             gint y);
void        gtk_layout_move                 (GtkLayout *layout,
                                             GtkWidget *child_widget,
                                             gint x,
                                             gint y);
void        gtk_layout_set_size             (GtkLayout *layout,
                                             guint width,
                                             guint height);
void        gtk_layout_get_size             (GtkLayout *layout,
                                             guint *width,
                                             guint *height);
void        gtk_layout_freeze               (GtkLayout *layout);
void        gtk_layout_thaw                 (GtkLayout *layout);
GtkAdjustment* gtk_layout_get_hadjustment   (GtkLayout *layout);
GtkAdjustment* gtk_layout_get_vadjustment   (GtkLayout *layout);
void        gtk_layout_set_hadjustment      (GtkLayout *layout,
                                             GtkAdjustment *adjustment);
void        gtk_layout_set_vadjustment      (GtkLayout *layout,
                                             GtkAdjustment *adjustment);


Object Hierarchy


  GObject
   +----GtkObject
         +----GtkWidget
               +----GtkContainer
                     +----GtkLayout

Implemented Interfaces

GtkLayout implements AtkImplementorIface.

Properties


  "hadjustment"          GtkAdjustment         : Read / Write
  "height"               guint                 : Read / Write
  "vadjustment"          GtkAdjustment         : Read / Write
  "width"                guint                 : Read / Write

Child Properties


  "x"                    gint                  : Read / Write
  "y"                    gint                  : Read / Write

Signal Prototypes


"set-scroll-adjustments"
            void        user_function      (GtkLayout *layout,
                                            GtkAdjustment *arg1,
                                            GtkAdjustment *arg2,
                                            gpointer user_data);

Description

GtkLayout is similar to GtkDrawingArea in that it's a "blank slate" and doesn't do anything but paint a blank background by default. It's different in that it supports scrolling natively (you can add it to a GtkScrolledWindow), and it can contain child widgets, since it's a GtkContainer. However if you're just going to draw, a GtkDrawingArea is a better choice since it has lower overhead.

When handling expose events on a GtkLayout, you must draw to GTK_LAYOUT (layout)->bin_window, rather than to GTK_WIDGET (layout)->window, as you would for a drawing area.

Details

GtkLayout

typedef struct {
  GdkWindow *bin_window;
} GtkLayout;


gtk_layout_new ()

GtkWidget*  gtk_layout_new                  (GtkAdjustment *hadjustment,
                                             GtkAdjustment *vadjustment);

Creates a new GtkLayout. Unless you have a specific adjustment you'd like the layout to use for scrolling, pass NULL for hadjustment and vadjustment.

hadjustment : horizontal scroll adjustment, or NULL
vadjustment : vertical scroll adjustment, or NULL
Returns : a new GtkLayout

gtk_layout_put ()

void        gtk_layout_put                  (GtkLayout *layout,
                                             GtkWidget *child_widget,
                                             gint x,
                                             gint y);

Adds child_widget to layout, at position (x,y). layout becomes the new parent container of child_widget.

layout : a GtkLayout
child_widget : child widget
x : X position of child widget
y : Y position of child widget

gtk_layout_move ()

void        gtk_layout_move                 (GtkLayout *layout,
                                             GtkWidget *child_widget,
                                             gint x,
                                             gint y);

Moves a current child of layout to a new position.

layout : a GtkLayout
child_widget : a current child of layout
x : X position to move to
y : Y position to move to

gtk_layout_set_size ()

void        gtk_layout_set_size             (GtkLayout *layout,
                                             guint width,
                                             guint height);

Sets the size of the scrollable area of the layout.

layout : a GtkLayout
width : width of entire scrollable area
height : height of entire scrollable area

gtk_layout_get_size ()

void        gtk_layout_get_size             (GtkLayout *layout,
                                             guint *width,
                                             guint *height);

Gets the size that has been set on the layout, and that determines the total extents of the layout's scrollbar area. See gtk_layout_set_size().

layout : a GtkLayout
width : location to store the width set on layout, or NULL
height : location to store the height set on layout, or NULL

gtk_layout_freeze ()

void        gtk_layout_freeze               (GtkLayout *layout);

Warning

gtk_layout_freeze is deprecated and should not be used in newly-written code.

This is a deprecated function, it doesn't do anything useful.

layout : a GtkLayout

gtk_layout_thaw ()

void        gtk_layout_thaw                 (GtkLayout *layout);

Warning

gtk_layout_thaw is deprecated and should not be used in newly-written code.

This is a deprecated function, it doesn't do anything useful.

layout : a GtkLayout

gtk_layout_get_hadjustment ()

GtkAdjustment* gtk_layout_get_hadjustment   (GtkLayout *layout);

This function should only be called after the layout has been placed in a GtkScrolledWindow or otherwise configured for scrolling. It returns the GtkAdjustment used for communication between the horizontal scrollbar and layout.

See GtkScrolledWindow, GtkScrollbar, GtkAdjustment for details.

layout : a GtkLayout
Returns : horizontal scroll adjustment

gtk_layout_get_vadjustment ()

GtkAdjustment* gtk_layout_get_vadjustment   (GtkLayout *layout);

This function should only be called after the layout has been placed in a GtkScrolledWindow or otherwise configured for scrolling. It returns the GtkAdjustment used for communication between the vertical scrollbar and layout.

See GtkScrolledWindow, GtkScrollbar, GtkAdjustment for details.

layout : a GtkLayout
Returns : vertical scroll adjustment

gtk_layout_set_hadjustment ()

void        gtk_layout_set_hadjustment      (GtkLayout *layout,
                                             GtkAdjustment *adjustment);

Sets the horizontal scroll adjustment for the layout.

See GtkScrolledWindow, GtkScrollbar, GtkAdjustment for details.

layout : a GtkLayout
adjustment : new scroll adjustment

gtk_layout_set_vadjustment ()

void        gtk_layout_set_vadjustment      (GtkLayout *layout,
                                             GtkAdjustment *adjustment);

Sets the vertical scroll adjustment for the layout.

See GtkScrolledWindow, GtkScrollbar, GtkAdjustment for details.

layout : a GtkLayout
adjustment : new scroll adjustment

Properties

The "hadjustment" property

  "hadjustment"          GtkAdjustment         : Read / Write

The GtkAdjustment for the horizontal position.


The "height" property

  "height"               guint                 : Read / Write

The height of the layout.

Allowed values: <= G_MAXINT

Default value: 100


The "vadjustment" property

  "vadjustment"          GtkAdjustment         : Read / Write

The GtkAdjustment for the vertical position.


The "width" property

  "width"                guint                 : Read / Write

The width of the layout.

Allowed values: <= G_MAXINT

Default value: 100

Child Properties

The "x" child property

  "x"                    gint                  : Read / Write

X position of child widget.

Default value: 0


The "y" child property

  "y"                    gint                  : Read / Write

Y position of child widget.

Default value: 0

Signals

The "set-scroll-adjustments" signal

void        user_function                  (GtkLayout *layout,
                                            GtkAdjustment *arg1,
                                            GtkAdjustment *arg2,
                                            gpointer user_data);

layout :the object which received the signal.
arg1 :
arg2 :
user_data :user data set when the signal handler was connected.

See Also

GtkDrawingArea, GtkScrolledWindow