Started the GTK+ uiArea implementation. Much of the scrolling boilerplate is finished.
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Pietro Gagliardi
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e47bd367e1
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04dcccf914
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// 4 september 2015
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#include "area.h"
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struct areaPrivate {
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uiArea *a;
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uiAreaHandler *ah;
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GtkAdjustment *ha;
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GtkAdjustment *va;
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int clientWidth;
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int clientHeight;
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// needed for GtkScrollable
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GtkScrollablePolicy hpolicy, vpolicy;
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};
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static void areaWidget_scrollable_init(GtkScrollable *);
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G_DEFINE_ABSTRACT_TYPE_WITH_CODE(areaWidget, areaWidget, GTK_TYPE_DRAWING_AREA,
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G_IMPLEMENT_INTERFACE(GTK_TYPE_SCROLLABLE, areaWidget_scrollable_init))
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static void updateScroll(areaWidget *a)
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{
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struct areaPrivate *ap = a->priv;
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uintmax_t count, pixelsPer;
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// don't call if too early
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if (ap->ha == NULL || ap->va == NULL)
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return;
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(*(ap->ah->HScrollConfig))(ap->ah, ap->a,
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&count, &pixelsPer);
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gtk_adjustment_configure(ap->ha,
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gtk_adjustment_get_value(ap->ha),
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0,
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count,
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1,
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ap->clientWidth / pixelsPer,
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ap->clientWidth / pixelsPer);
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(*(ap->ah->VScrollConfig))(ap->ah, ap->a,
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&count, &pixelsPer);
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gtk_adjustment_configure(ap->va,
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gtk_adjustment_get_value(ap->va),
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0,
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count,
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1,
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ap->clientHeight / pixelsPer,
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ap->clientHeight / pixelsPer);
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// TODO notify adjustment changes?
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g_object_notify(G_OBJECT(a), "hadjustment");
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g_object_notify(G_OBJECT(a), "vadjustment");
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}
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static void areaWidget_init(areaWidget *a)
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{
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a->priv = G_TYPE_INSTANCE_GET_PRIVATE(a, areaWidgetType, struct areaPrivate);
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// for events
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gtk_widget_add_events(GTK_WIDGET(a),
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GDK_POINTER_MOTION_MASK |
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GDK_BUTTON_MOTION_MASK |
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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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GDK_KEY_RELEASE_MASK);
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// for scrolling
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// TODO do we need GDK_TOUCH_MASK?
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gtk_widget_add_events(GTK_WIDGET(a),
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GDK_SCROLL_MASK |
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GDK_TOUCH_MASK |
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GDK_SMOOTH_SCROLL_MASK);
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gtk_widget_set_can_focus(GTK_WIDGET(a), TRUE);
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}
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static void areaWidget_dispose(GObject *obj)
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{
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struct areaPrivate *ap = areaWidget(obj)->priv;
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if (ap->ha != NULL) {
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g_object_unref(ap->ha);
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ap->ha = NULL;
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}
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if (ap->va != NULL) {
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g_object_unref(ap->va);
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ap->va = NULL;
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}
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G_OBJECT_CLASS(areaWidget_parent_class)->dispose(obj);
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}
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static void areaWidget_finalize(GObject *obj)
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{
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G_OBJECT_CLASS(areaWidget_parent_class)->finalize(obj);
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}
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static void areaWidget_size_allocate(GtkWidget *w, GtkAllocation *allocation)
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{
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struct areaPrivate *ap = areaWidget(w)->priv;
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// GtkDrawingArea has a size_allocate() implementation; we need to call it
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// this will call gtk_widget_set_allocation() for us
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GTK_WIDGET_CLASS(areaWidget_parent_class)->size_allocate(w, allocation);
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ap->clientWidth = allocation->width;
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ap->clientHeight = allocation->height;
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updateScroll(areaWidget(w));
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}
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// TODO draw
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// TODO preferred height/width
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// TODO events
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enum {
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pHAdjustment = 1,
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pVAdjustment,
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pHScrollPolicy,
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pVScrollPolicy,
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nProps,
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};
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static void onValueChanged(GtkAdjustment *a, gpointer data)
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{
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gtk_widget_queue_draw(GTK_WIDGET(data));
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}
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static void replaceAdjustment(areaWidget *a, GtkAdjustment **adj, const GValue *value)
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{
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if (*adj != NULL) {
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g_signal_handlers_disconnect_by_func(*adj, G_CALLBACK(onValueChanged), cc);
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g_object_unref(*adj);
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}
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*adj = GTK_ADJUSTMENT(g_value_get_object(value));
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if (*adj != NULL)
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g_object_ref_sink(*adj);
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else
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*adj = gtk_adjustment_new(0, 0, 0, 0, 0, 0);
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g_signal_connect(*adj, "value-changed", G_CALLBACK(onValueChanged), a);
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updateScroll(a);
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}
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static void areaWidget_set_property(GObject *obj, guint prop, const GValue *value, GParamSpec *pspec)
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{
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areaWidget *a = areaWidget(obj);
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struct areaPrivate *ap = a->priv;
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switch (prop) {
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case pHAdjustment:
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replaceAdjustment(a, &(ap->ha), value);
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return;
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case pVAdjustment:
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replaceAdjustment(a, &(ap->va), value);
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return;
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case pHScrollPolicy:
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ap->hpolicy = g_value_get_enum(value);
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return;
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case pVScrollPolicy:
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ap->vpolicy = g_value_get_enum(value);
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return;
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}
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G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, prop, pspec);
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}
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static void areaWidget_get_property(GObject *obj, guint prop, GValue *value, GParamSpec *pspec)
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{
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areaWidget *a = areaWidget(obj);
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struct areaPrivate *ap = a->priv;
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switch (prop) {
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case pHAdjustment:
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g_value_set_object(value, ap->ha);
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return;
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case pVAdjustment:
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g_value_set_object(value, ap->va);
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return;
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case pHScrollPolicy:
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g_value_set_enum(value, ap->hpolicy);
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return;
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case pVScrollPolicy:
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g_value_set_enum(value, ap->vpolicy);
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return;
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}
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G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, prop, pspec);
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}
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static void areaWidget_class_init(areaWidgetClass *class)
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{
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G_OBJECT_CLASS(class)->dispose = areaWidget_dispose;
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G_OBJECT_CLASS(class)->finalize = areaWidget_finalize;
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G_OBJECT_CLASS(class)->set_property = areaWidget_set_property;
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G_OBJECT_CLASS(class)->get_property = areaWidget_get_property;
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GTK_WIDGET_CLASS(class)->size_allocate = areaWidget_size_allocate;
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// GTK_WIDGET_CLASS(class)->draw = areaWidget_draw;
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// GTK_WIDGET_CLASS(class)->get_preferred_height = areaWidget_get_preferred_height;
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// GTK_WIDGET_CLASS(class)->get_preferred_width = areaWidget_get_preferred_width;
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// GTK_WIDGET_CLASS(class)->button_press_event = areaWidget_button_press_event;
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// GTK_WIDGET_CLASS(class)->button_release_event = areaWidget_button_release_event;
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// GTK_WIDGET_CLASS(class)->motion_notify_event = areaWidget_motion_notify_event;
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// GTK_WIDGET_CLASS(class)->key_press_event = areaWidget_key_press_event;
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// this is the actual interface implementation
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g_object_class_override_property(G_OBJECT_CLASS(class), pHAdjustment, "hadjustment");
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g_object_class_override_property(G_OBJECT_CLASS(class), pVAdjustment, "vadjustment");
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g_object_class_override_property(G_OBJECT_CLASS(class), pHScrollPolicy, "hscroll-policy");
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g_object_class_override_property(G_OBJECT_CLASS(class), pVScrollPolicy, "vscroll-policy");
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}
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static void areaWidget_scrollable_init(GtkScrollable *iface)
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{
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// no need to do anything; the interface only has properties
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}
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@ -0,0 +1,29 @@
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// 4 september 2015
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#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_32
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#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_32
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#define GDK_VERSION_MIN_REQUIRED GDK_VERSION_3_4
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#define GDK_VERSION_MAX_ALLOWED GDK_VERSION_3_4
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#include <gtk/gtk.h>
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#define areaWidgetType (areaWidget_get_type())
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#define areaWidget(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), areaWidgetType, areaWidget))
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#define isAreaWidget(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), areaWidgetType))
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#define areaWidgetClass(class) (G_TYPE_CHECK_CLASS_CAST((class), areaWidgetType, areaWidgetClass))
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#define isAreaWidgetClass(class) (G_TYPE_CHECK_CLASS_TYPE((class), areaWidget))
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#define getAreaWidgetClass(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), areaWidgetType, areaWidgetClass))
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typedef struct areaWidget areaWidget;
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typedef struct areaWidgetClass areaWidgetClass;
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struct areaWidget {
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GtkDrawingArea parent_instance;
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struct areaPrivate *priv;
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};
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struct areaWidgetClass {
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GtkDrawingAreaClass parent_class;
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};
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extern GType areaWidget_get_type(void);
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#include "ui.h"
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@ -0,0 +1,13 @@
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// 4 september 2015
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typedef struct uiArea uiArea;
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typedef struct uiAreaHandler uiAreaHandler;
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typedef struct uiAreaDrawParams uiAreaDrawParams;
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struct uiAreaHandler {
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// TODO draw
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void (*HScrollConfig)(uiAreaHandler *, uiArea *, uintmax_t *, uintmax_t *);
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void (*VScrollConfig)(uiAreaHandler *, uiArea *, uintmax_t *, uintmx_t *);
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};
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// TODO uiAreaDrawParams
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