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