New "pizza" widget implementation (should have been part of previous commit)
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49688 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Paul Cornett
373
src/gtk/win_gtk.cpp
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373
src/gtk/win_gtk.cpp
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///////////////////////////////////////////////////////////////////////////////
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// Name: src/gtk/win_gtk.cpp
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// Purpose: native GTK+ widget for wxWindow
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// Author: Paul Cornett
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// Id: $Id$
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// Copyright: (c) 2007 Paul Cornett
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#include "wx/defs.h"
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#include "wx/gtk/win_gtk.h"
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/*
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wxPizza is a custom GTK+ widget derived from GtkFixed. A custom widget
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is needed to adapt GTK+ to wxWidgets needs in 3 areas: scrolling, window
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borders, and RTL.
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For scrolling, the "set_scroll_adjustments" signal is implemented
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to make wxPizza appear scrollable to GTK+, allowing it to be put in a
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GtkScrolledWindow. Child widget positions are adjusted for the scrolling
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position in size_allocate. A second same-size GdkWindow is placed behind
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widget->window, to allow GDK to use a more efficient scrolling technique.
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For borders, space is reserved in realize and size_allocate.
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For non-scrolling wxWindows, a second GdkWindow is used for the
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border; scrolling wxWindows draw their border on wxPizza's parent
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(a GtkScrolledWindow) GdkWindow. Border widths for sunken and raised
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styles are taken from widget->style, so they will match the current theme.
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For RTL, child widget positions are mirrored in size_allocate.
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*/
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static GtkWidgetClass* parent_class;
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extern "C" {
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struct wxPizzaClass
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{
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GtkFixedClass parent;
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void (*set_scroll_adjustments)(GtkWidget*, GtkAdjustment*, GtkAdjustment*);
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};
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static void size_allocate(GtkWidget* widget, GtkAllocation* alloc)
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{
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const bool is_resize =
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widget->allocation.width != alloc->width ||
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widget->allocation.height != alloc->height;
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const bool is_move =
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widget->allocation.x != alloc->x ||
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widget->allocation.y != alloc->y;
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widget->allocation = *alloc;
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wxPizza* pizza = WX_PIZZA(widget);
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int border_x, border_y;
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pizza->get_border_widths(border_x, border_y);
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int w = alloc->width - 2 * border_x;
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if (w < 0) w = 0;
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if (GTK_WIDGET_REALIZED(widget) && (is_move || is_resize))
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{
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int h = alloc->height - 2 * border_y;
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if (h < 0) h = 0;
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if (pizza->m_is_scrollable)
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{
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// backing window is inside border
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gdk_window_move_resize(pizza->m_backing_window,
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alloc->x + border_x, alloc->y + border_y, w, h);
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}
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else
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{
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// border window (or only window if
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// no-scroll no-border) is full size
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GdkWindow* window = pizza->m_backing_window;
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if (window == NULL)
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window = widget->window;
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gdk_window_move_resize(
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window, alloc->x, alloc->y, alloc->width, alloc->height);
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}
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if (is_resize && pizza->m_backing_window)
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{
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// main window is inside border
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if (pizza->m_is_scrollable)
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gdk_window_resize(widget->window, w, h);
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else
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// need move as well as resize because border can change
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gdk_window_move_resize(widget->window, border_x, border_y, w, h);
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// wxWidgets turns off redraw-on-allocate by default,
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// so border area needs to be invalidated
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if (border_x > 1 || border_y > 1)
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{
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if (pizza->m_is_scrollable)
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; // invalidate does not seem to be needed in this case
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else
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gdk_window_invalidate_rect(pizza->m_backing_window, NULL, false);
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}
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}
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}
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// adjust child positions
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for (const GList* list = pizza->m_fixed.children; list; list = list->next)
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{
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const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
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if (GTK_WIDGET_VISIBLE(child->widget))
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{
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GtkAllocation child_alloc;
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// note that child positions do not take border into
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// account, they need to be relative to widget->window,
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// which has already been adjusted
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child_alloc.x = child->x - pizza->m_scroll_x;
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child_alloc.y = child->y - pizza->m_scroll_y;
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GtkRequisition req;
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gtk_widget_get_child_requisition(child->widget, &req);
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child_alloc.width = req.width;
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child_alloc.height = req.height;
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if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
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{
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child_alloc.x = w - child_alloc.x - child_alloc.width;
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}
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gtk_widget_size_allocate(child->widget, &child_alloc);
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}
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}
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}
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static void realize(GtkWidget* widget)
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{
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parent_class->realize(widget);
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wxPizza* pizza = WX_PIZZA(widget);
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// second window is created if there is a border, or wxWindow is scrollable
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if (pizza->m_border_style || pizza->m_is_scrollable)
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{
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GdkWindowAttr attr;
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attr.event_mask = pizza->m_is_scrollable ? 0 : GDK_EXPOSURE_MASK;
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attr.x = widget->allocation.x;
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attr.y = widget->allocation.y;
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attr.width = widget->allocation.width;
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attr.height = widget->allocation.height;
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int border_x, border_y;
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pizza->get_border_widths(border_x, border_y);
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int w = widget->allocation.width - 2 * border_x;
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int h = widget->allocation.height - 2 * border_y;
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if (w < 0) w = 0;
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if (h < 0) h = 0;
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if (pizza->m_is_scrollable)
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{
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attr.x += border_x;
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attr.y += border_y;
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attr.width = w;
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attr.height = h;
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}
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attr.wclass = GDK_INPUT_OUTPUT;
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attr.visual = gtk_widget_get_visual(widget);
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attr.colormap = gtk_widget_get_colormap(widget);
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attr.window_type = GDK_WINDOW_CHILD;
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pizza->m_backing_window = gdk_window_new(
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gdk_window_get_parent(widget->window),
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&attr,
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GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP);
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gdk_window_set_user_data(pizza->m_backing_window, widget);
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if (pizza->m_is_scrollable)
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gdk_window_reparent(widget->window, pizza->m_backing_window, 0, 0);
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else
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gdk_window_reparent(widget->window, pizza->m_backing_window, border_x, border_y);
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gdk_window_resize(widget->window, w, h);
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}
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}
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static void unrealize(GtkWidget* widget)
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{
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parent_class->unrealize(widget);
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wxPizza* pizza = WX_PIZZA(widget);
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if (pizza->m_backing_window)
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{
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gdk_window_set_user_data(pizza->m_backing_window, NULL);
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gdk_window_destroy(pizza->m_backing_window);
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pizza->m_backing_window = NULL;
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}
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}
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static void map(GtkWidget* widget)
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{
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parent_class->map(widget);
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wxPizza* pizza = WX_PIZZA(widget);
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if (pizza->m_backing_window)
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gdk_window_show(pizza->m_backing_window);
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}
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static void unmap(GtkWidget* widget)
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{
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parent_class->unmap(widget);
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wxPizza* pizza = WX_PIZZA(widget);
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if (pizza->m_backing_window)
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gdk_window_hide(pizza->m_backing_window);
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}
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// not used, but needs to exist so gtk_widget_set_scroll_adjustments will work
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static void set_scroll_adjustments(GtkWidget*, GtkAdjustment*, GtkAdjustment*)
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{
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}
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// Marshaller needed for set_scroll_adjustments signal,
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// generated with GLib-2.4.6 glib-genmarshal
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#define g_marshal_value_peek_object(v) g_value_get_object (v)
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static void
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g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure *closure,
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GValue * /*return_value*/,
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guint n_param_values,
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const GValue *param_values,
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gpointer /*invocation_hint*/,
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gpointer marshal_data)
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{
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typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer data1,
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gpointer arg_1,
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gpointer arg_2,
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gpointer data2);
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register GMarshalFunc_VOID__OBJECT_OBJECT callback;
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register GCClosure *cc = (GCClosure*) closure;
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register gpointer data1, data2;
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g_return_if_fail (n_param_values == 3);
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if (G_CCLOSURE_SWAP_DATA (closure))
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{
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data1 = closure->data;
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data2 = g_value_peek_pointer (param_values + 0);
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}
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else
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{
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data1 = g_value_peek_pointer (param_values + 0);
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data2 = closure->data;
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}
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callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
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callback (data1,
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g_marshal_value_peek_object (param_values + 1),
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g_marshal_value_peek_object (param_values + 2),
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data2);
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}
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static void class_init(void* g_class, void*)
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{
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GtkWidgetClass* widget_class = (GtkWidgetClass*)g_class;
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widget_class->size_allocate = size_allocate;
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widget_class->realize = realize;
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widget_class->unrealize = unrealize;
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widget_class->map = map;
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widget_class->unmap = unmap;
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wxPizzaClass* klass = (wxPizzaClass*)g_class;
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// needed to make widget appear scrollable to GTK+
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klass->set_scroll_adjustments = set_scroll_adjustments;
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widget_class->set_scroll_adjustments_signal =
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g_signal_new(
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"set_scroll_adjustments",
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G_TYPE_FROM_CLASS(g_class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET(wxPizzaClass, set_scroll_adjustments),
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NULL, NULL,
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g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
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G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
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parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(g_class));
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}
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} // extern "C"
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GType wxPizza::type()
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{
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static GtkType type;
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if (type == 0)
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{
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const GTypeInfo info = {
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sizeof(wxPizzaClass),
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NULL, NULL,
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class_init,
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NULL, NULL,
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sizeof(wxPizza), 0,
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NULL, NULL
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};
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type = g_type_register_static(
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GTK_TYPE_FIXED, "wxPizza", &info, GTypeFlags(0));
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}
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return type;
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}
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GtkWidget* wxPizza::New(long windowStyle)
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{
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GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
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wxPizza* pizza = WX_PIZZA(widget);
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pizza->m_backing_window = NULL;
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pizza->m_scroll_x = 0;
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pizza->m_scroll_y = 0;
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pizza->m_is_scrollable = (windowStyle & (wxHSCROLL | wxVSCROLL)) != 0;
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pizza->m_border_style =
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int(windowStyle & (wxBORDER_SIMPLE | wxBORDER_RAISED | wxBORDER_SUNKEN));
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gtk_fixed_set_has_window(GTK_FIXED(widget), true);
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gtk_widget_add_events(widget,
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GDK_EXPOSURE_MASK |
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GDK_SCROLL_MASK |
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GDK_POINTER_MOTION_MASK |
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GDK_POINTER_MOTION_HINT_MASK |
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GDK_BUTTON_MOTION_MASK |
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GDK_BUTTON1_MOTION_MASK |
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||||||
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GDK_BUTTON2_MOTION_MASK |
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||||||
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GDK_BUTTON3_MOTION_MASK |
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||||||
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GDK_BUTTON_PRESS_MASK |
|
||||||
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GDK_BUTTON_RELEASE_MASK |
|
||||||
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GDK_KEY_PRESS_MASK |
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||||||
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GDK_KEY_RELEASE_MASK |
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GDK_ENTER_NOTIFY_MASK |
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||||||
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GDK_LEAVE_NOTIFY_MASK |
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GDK_FOCUS_CHANGE_MASK);
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gtk_container_set_resize_mode(GTK_CONTAINER(widget), GTK_RESIZE_QUEUE);
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return widget;
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||||||
|
}
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||||||
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||||||
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// gtk_fixed_move does not check for a change before issuing a queue_resize,
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// we need to avoid that to prevent endless sizing loops, so check first
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||||||
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void wxPizza::move(GtkWidget* widget, int x, int y)
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||||||
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{
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GtkFixed* fixed = &m_fixed;
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for (const GList* list = fixed->children; list; list = list->next)
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{
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const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
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||||||
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if (child->widget == widget)
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||||||
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{
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if (child->x != x || child->y != y)
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gtk_fixed_move(fixed, widget, x, y);
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||||||
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break;
|
||||||
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}
|
||||||
|
}
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||||||
|
}
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||||||
|
|
||||||
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void wxPizza::scroll(int dx, int dy)
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||||||
|
{
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GtkWidget* widget = GTK_WIDGET(this);
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|
if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
|
||||||
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dx = -dx;
|
||||||
|
m_scroll_x -= dx;
|
||||||
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m_scroll_y -= dy;
|
||||||
|
if (widget->window)
|
||||||
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gdk_window_scroll(widget->window, dx, dy);
|
||||||
|
const GList* list = m_fixed.children;
|
||||||
|
if (list)
|
||||||
|
{
|
||||||
|
const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
|
||||||
|
// queueing a resize on any child will update them all
|
||||||
|
gtk_widget_queue_resize(child->widget);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void wxPizza::get_border_widths(int& x, int& y)
|
||||||
|
{
|
||||||
|
x = y = 0;
|
||||||
|
if (m_border_style & wxBORDER_SIMPLE)
|
||||||
|
x = y = 1;
|
||||||
|
else if (m_border_style)
|
||||||
|
{
|
||||||
|
GtkWidget* widget = GTK_WIDGET(this);
|
||||||
|
if (widget->style)
|
||||||
|
{
|
||||||
|
x = widget->style->xthickness;
|
||||||
|
y = widget->style->ythickness;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
Reference in New Issue
Block a user