forked from AuroraMiddleware/gtk
dc754528a0
Mon Oct 22 14:08:26 2001 Jonathan Blandford <jrb@redhat.com> * demos/gtk-demo/appwindow.c: Remove handle_box from App demo. * gtk/gtktreeview.c (size_allocate): Move to a different drawing system. Instead of having a window the size of the tree, we have a window the size of widget->allocation, and simply draw with the offset. (coords_are_over_arrow): ditto. Move to window coordinates. (do_prelight): ditto (do_unprelight): ditto * gtk/gtktreemodelsort.c (gtk_tree_model_sort_rows_reordered): Minor fix from Kristian Rietveld to fix unsorted case.
259 lines
8.0 KiB
Plaintext
259 lines
8.0 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GtkScrolledWindow
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<!-- ##### SECTION Short_Description ##### -->
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Adds scrollbars to its child widget.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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#GtkScrolledWindow is a #GtkBin subclass: it's a container
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the accepts a single child widget. #GtkScrolledWindow adds scrollbars
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to the child widget and optionally draws a beveled frame around the
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child widget.
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</para>
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<para>
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The scrolled window can work in two ways. Some widgets have native
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scrolling support; these widgets have "slots" for #GtkAdjustment
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objects.
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<footnote><para>The scrolled window installs #GtkAdjustment objects in
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the child window's slots using the set_scroll_adjustments_signal,
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found in #GtkWidgetClass. (Conceptually, these widgets implement a
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"Scrollable" interface; because GTK+ 1.2 lacked interface support in
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the object system, this interface is hackily implemented as a signal
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in #GtkWidgetClass. The GTK+ 2.0 object system would allow a clean
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implementation, but it wasn't worth breaking the
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API.)</para></footnote>
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Widgets with native scroll support include #GtkTreeView, #GtkTextView,
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and #GtkLayout.
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</para>
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<para>
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For widgets that lack native scrolling support, the #GtkViewport
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widget acts as an adaptor class, implementing scrollability for child
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widgets that lack their own scrolling capabilities. Use #GtkViewport
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to scroll child widgets such as #GtkTable, #GtkBox, and so on.
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</para>
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<para>
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If a widget has native scrolling abilities, it can be added to the
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#GtkScrolledWindow with gtk_container_add(). If a widget does not, you
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must first add the widget to a #GtkViewport, then add the #GtkViewport
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to the scrolled window. The convenience function
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gtk_scrolled_window_add_with_viewport() does exactly this, so you can
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ignore the presence of the viewport.
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</para>
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<para>
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The position of the scrollbars is controlled by the scroll
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adjustments. See #GtkAdjustment for the fields in an adjustment - for
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#GtkScrollbar, used by #GtkScrolledWindow, the "value" field
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represents the position of the scrollbar, which must be between the
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"lower" field and "upper - page_size." The "page_size" field
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represents the size of the visible scrollable area. The
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"step_increment" and "page_increment" fields are used when the user
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asks to step down (using the small stepper arrows) or page down (using
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for example the PageDown key).
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</para>
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<para>
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If a #GtkScrolledWindow doesn't behave quite as you would like, or
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doesn't have exactly the right layout, it's very possible to set up
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your own scrolling with #GtkScrollbar and for example a #GtkTable.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#GtkViewport, #GtkAdjustment, #GtkWidgetClass
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</para>
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<!-- ##### STRUCT GtkScrolledWindow ##### -->
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<para>
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There are no public fields in the #GtkScrolledWindow struct; it should
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only be accessed using the functions below.
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</para>
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<!-- ##### FUNCTION gtk_scrolled_window_new ##### -->
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<para>
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Creates a new scrolled window. The two arguments are the scrolled
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window's adjustments; these will be shared with the scrollbars and the
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child widget to keep the bars in sync with the child. Usually you want
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to pass %NULL for the adjustments, which will cause the scrolled window
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to create them for you.
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</para>
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@hadjustment: Horizontal adjustment.
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@vadjustment: Vertical adjustment.
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@Returns: New scrolled window.
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<!-- ##### FUNCTION gtk_scrolled_window_get_hadjustment ##### -->
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<para>
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Returns the horizontal scrollbar's adjustment, used to connect the
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horizontal scrollbar to the child widget's horizontal scroll
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functionality.
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</para>
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@scrolled_window: A #GtkScrolledWindow.
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@Returns: The horizontal #GtkAdjustment.
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<!-- ##### FUNCTION gtk_scrolled_window_get_vadjustment ##### -->
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<para>
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Returns the vertical scrollbar's adjustment, used to connect the
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vertical scrollbar to the child widget's vertical scroll
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functionality.
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</para>
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@scrolled_window: A #GtkScrolledWindow.
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@Returns: The vertical #GtkAdjustment.
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<!-- ##### FUNCTION gtk_scrolled_window_set_policy ##### -->
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<para>
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Sets the scrollbar policy for the horizontal and vertical scrollbars.
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The policy determines when the scrollbar should appear; it is a value
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from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
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scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
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never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only
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if needed (that is, if the slider part of the bar would be smaller
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than the trough - the display is larger than the page size).
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</para>
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@scrolled_window: A #GtkScrolledWindow.
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@hscrollbar_policy: Policy for horizontal bar.
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@vscrollbar_policy: Policy for vertical bar.
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<!-- ##### FUNCTION gtk_scrolled_window_add_with_viewport ##### -->
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<para>
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Used to add children without native scrolling capabilities. This is
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simply a convenience function; it is equivalent to adding the
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unscrollable child to a viewport, then adding the viewport to the
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scrolled window. If a child has native scrolling, use
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gtk_container_add() instead of this function.
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</para>
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<para>
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The viewport scrolls the child by moving its #GdkWindow, and takes the
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size of the child to be the size of its toplevel #GdkWindow. This will
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be very wrong for most widgets that support native scrolling; for
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example, if you add a widget such as #GtkTreeView with a viewport, the
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whole widget will scroll, including the column headings. Thus, widgets
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with native scrolling support should not be used with the #GtkViewport proxy.
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</para>
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<para>
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A widget supports scrolling natively if the
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set_scroll_adjustments_signal field in #GtkWidgetClass is non-zero,
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i.e. has been filled in with a valid signal identifier.
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</para>
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@scrolled_window: A #GtkScrolledWindow.
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@child: Widget you want to scroll.
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<!-- ##### FUNCTION gtk_scrolled_window_set_placement ##### -->
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<para>
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Determines the location of the child widget with respect to the
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scrollbars. The default is %GTK_CORNER_TOP_LEFT, meaning the child is
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in the top left, with the scrollbars underneath and to the right.
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Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
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%GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
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</para>
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@scrolled_window: A #GtkScrolledWindow.
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@window_placement: Position of the child window.
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<!-- ##### FUNCTION gtk_scrolled_window_set_shadow_type ##### -->
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<para>
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</para>
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@scrolled_window:
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@type:
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<!-- ##### FUNCTION gtk_scrolled_window_set_hadjustment ##### -->
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<para>
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Sets the #GtkAdjustment for the horizontal scrollbar.
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</para>
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@scrolled_window: A #GtkScrolledWindow.
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@hadjustment: Horizontal scroll adjustment.
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<!-- ##### FUNCTION gtk_scrolled_window_set_vadjustment ##### -->
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<para>
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Sets the #GtkAdjustment for the vertical scrollbar.
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</para>
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@scrolled_window: A #GtkScrolledWindow.
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@hadjustment:
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<!-- # Unused Parameters # -->
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@vadjustment: Vertical scroll adjustment.
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<!-- ##### FUNCTION gtk_scrolled_window_get_placement ##### -->
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<para>
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</para>
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@scrolled_window:
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@Returns:
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<!-- ##### FUNCTION gtk_scrolled_window_get_policy ##### -->
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<para>
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</para>
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@scrolled_window:
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@hscrollbar_policy:
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@vscrollbar_policy:
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<!-- ##### FUNCTION gtk_scrolled_window_get_shadow_type ##### -->
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<para>
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</para>
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@scrolled_window:
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@Returns:
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<!-- ##### ARG GtkScrolledWindow:hadjustment ##### -->
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<para>
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Horizontal adjustment. See gtk_scrolled_window_set_hadjustment(), gtk_scrolled_window_get_hadjustment().
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</para>
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<!-- ##### ARG GtkScrolledWindow:vadjustment ##### -->
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<para>
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Vertical adjustment. See gtk_scrolled_window_set_vadjustment(), gtk_scrolled_window_get_vadjustment().
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</para>
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<!-- ##### ARG GtkScrolledWindow:hscrollbar-policy ##### -->
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<para>
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Horizontal scrollbar policy (show scrollbar always, never, or "when appropriate").
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</para>
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<!-- ##### ARG GtkScrolledWindow:vscrollbar-policy ##### -->
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<para>
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Vertical scrollbar policy (show scrollbar always, never, or "when appropriate").
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</para>
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<!-- ##### ARG GtkScrolledWindow:window-placement ##### -->
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<para>
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Position of child window with respect to scrollbars; top left, top
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right, bottom left, bottom right.
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</para>
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<!-- ##### ARG GtkScrolledWindow:shadow-type ##### -->
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<para>
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Type of frame drawn around the child of the scrolled window.
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</para>
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