## 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);
    GdkWindow*          gtk_layout_get_bin_window           (GtkLayout *layout);

## Object Hierarchy

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

## Implemented Interfaces

GtkLayout implements AtkImplementorIface and GtkBuildable.

## 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

## Signals

      "set-scroll-adjustments"                         : Run Last / Action

## 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 *GSEAL (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`. allow-none.
`vadjustment` : | vertical scroll adjustment, or `NULL`. allow-none.
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`. allow-none.
`height` : | location to store the height set on `layout`, or `NULL`. allow-none.

### 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. allow-none.

### 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. allow-none.

### gtk_layout_get_bin_window ()

    GdkWindow*          gtk_layout_get_bin_window           (GtkLayout *layout);

Retrieve the bin window of the layout used for drawing operations.

`layout` : | a GtkLayout
Returns : | a GdkWindow

Since 2.14

## Property Details

### 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 Property Details

### 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

## Signal Details

### The `"set-scroll-adjustments"` signal

    void                user_function                      (GtkLayout     *horizontal,
                                                            GtkAdjustment *vertical,
                                                            GtkAdjustment *arg2,
                                                            gpointer       user_data)       : Run Last / Action

Set the scroll adjustments for the layout. Usually scrolled containers like GtkScrolledWindow will emit this signal to connect two instances of GtkScrollbar to the scroll directions of the GtkLayout.

`horizontal` : | the horizontal GtkAdjustment
`vertical` : | the vertical GtkAdjustment
`user_data` : | user data set when the signal handler was connected.

## See Also

GtkDrawingArea, GtkScrolledWindow