Make adding symbols to the diagram possible.
This required creating a simple framework for operations to LdCanvas. It is probable that it's going to require some changes when other operations are added. The basic idea behind it seems to be good, though.
This commit is contained in:
parent
713f2821e4
commit
d3e5483c84
255
src/ld-canvas.c
255
src/ld-canvas.c
@ -10,6 +10,7 @@
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#include <math.h>
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#include <gtk/gtk.h>
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#include <gdk/gdkkeysyms.h>
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#include "config.h"
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@ -39,6 +40,22 @@
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/* The default screen resolution in DPI units. */
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#define DEFAULT_SCREEN_RESOLUTION 96
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/*
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* OperationEnd:
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*
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* Called upon ending an operation.
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*/
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typedef void (*OperationEnd) (LdCanvas *self);
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struct _AddObjectData
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{
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LdDiagramObject *object;
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gboolean visible;
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};
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typedef struct _AddObjectData AddObjectData;
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/*
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* LdCanvasPrivate:
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* @diagram: A diagram object assigned to this canvas as a model.
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@ -48,6 +65,9 @@
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* @x: The X coordinate of the center of view.
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* @y: The Y coordinate of the center of view.
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* @zoom: The current zoom of the canvas.
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* @operation: The current operation.
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* @operation_data: Data related to the current operation.
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* @operation_end: A callback to end the operation.
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*/
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struct _LdCanvasPrivate
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{
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@ -60,8 +80,18 @@ struct _LdCanvasPrivate
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gdouble x;
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gdouble y;
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gdouble zoom;
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gint operation;
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OperationEnd operation_end;
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union
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{
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AddObjectData add_object;
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}
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operation_data;
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};
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#define OPER_DATA(self, member) ((self)->priv->operation_data.member)
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G_DEFINE_TYPE (LdCanvas, ld_canvas, GTK_TYPE_DRAWING_AREA);
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enum
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@ -71,7 +101,11 @@ enum
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PROP_LIBRARY
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};
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typedef struct _DrawData DrawData;
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enum
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{
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OPER_0,
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OPER_ADD_OBJECT
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};
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/*
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* DrawData:
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@ -88,6 +122,9 @@ struct _DrawData
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gdouble scale;
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};
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typedef struct _DrawData DrawData;
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static void ld_canvas_get_property (GObject *object, guint property_id,
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GValue *value, GParamSpec *pspec);
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static void ld_canvas_set_property (GObject *object, guint property_id,
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@ -104,11 +141,26 @@ static void on_size_allocate (GtkWidget *widget, GtkAllocation *allocation,
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static gdouble ld_canvas_get_base_unit_in_px (GtkWidget *self);
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static gdouble ld_canvas_get_scale_in_px (LdCanvas *self);
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static gboolean on_motion_notify (GtkWidget *widget, GdkEventMotion *event,
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gpointer user_data);
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static gboolean on_leave_notify (GtkWidget *widget, GdkEventCrossing *event,
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gpointer user_data);
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static gboolean on_button_press (GtkWidget *widget, GdkEventButton *event,
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gpointer user_data);
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static gboolean on_button_release (GtkWidget *widget, GdkEventButton *event,
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gpointer user_data);
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static void move_object_to_widget_coords (LdCanvas *self,
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LdDiagramObject *object, gdouble x, gdouble y);
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static LdSymbol *resolve_diagram_symbol (LdCanvas *self,
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LdDiagramSymbol *diagram_symbol);
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static gboolean get_symbol_clip_area_on_widget (LdCanvas *self,
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LdDiagramSymbol *diagram_symbol, gdouble *x, gdouble *y,
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gdouble *width, gdouble *height);
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static void queue_object_redraw (LdCanvas *self, LdDiagramObject *object);
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static void ld_canvas_real_cancel_operation (LdCanvas *self);
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static void ld_canvas_add_object_end (LdCanvas *self);
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static gboolean on_expose_event (GtkWidget *widget, GdkEventExpose *event,
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gpointer user_data);
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@ -123,6 +175,7 @@ ld_canvas_class_init (LdCanvasClass *klass)
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{
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GObjectClass *object_class;
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GtkWidgetClass *widget_class;
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GtkBindingSet *binding_set;
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GParamSpec *pspec;
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widget_class = GTK_WIDGET_CLASS (klass);
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@ -133,6 +186,11 @@ ld_canvas_class_init (LdCanvasClass *klass)
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object_class->finalize = ld_canvas_finalize;
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klass->set_scroll_adjustments = ld_canvas_real_set_scroll_adjustments;
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klass->cancel_operation = ld_canvas_real_cancel_operation;
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binding_set = gtk_binding_set_by_class (klass);
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gtk_binding_entry_add_signal (binding_set, GDK_Escape, 0,
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"cancel-operation", 0);
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/**
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* LdCanvas:diagram:
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@ -169,6 +227,18 @@ ld_canvas_class_init (LdCanvasClass *klass)
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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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/**
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* LdCanvas::cancel-operation:
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*
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* Cancel any current operation.
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*/
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klass->cancel_operation_signal = g_signal_new
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("cancel-operation", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
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G_STRUCT_OFFSET (LdCanvasClass, cancel_operation), NULL, NULL,
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g_cclosure_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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g_type_class_add_private (klass, sizeof (LdCanvasPrivate));
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}
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@ -187,9 +257,21 @@ ld_canvas_init (LdCanvas *self)
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g_signal_connect (self, "size-allocate",
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G_CALLBACK (on_size_allocate), NULL);
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g_signal_connect (self, "motion-notify-event",
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G_CALLBACK (on_motion_notify), NULL);
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g_signal_connect (self, "leave-notify-event",
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G_CALLBACK (on_leave_notify), NULL);
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g_signal_connect (self, "button-press-event",
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G_CALLBACK (on_button_press), NULL);
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g_signal_connect (self, "button-release-event",
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G_CALLBACK (on_button_release), NULL);
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g_object_set (self, "can-focus", TRUE, NULL);
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gtk_widget_add_events (GTK_WIDGET (self),
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GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK
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| GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
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| GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK
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| GDK_LEAVE_NOTIFY_MASK);
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}
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static void
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@ -557,8 +639,74 @@ ld_canvas_diagram_to_widget_coords (LdCanvas *self,
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}
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/* ===== Operations ======================================================== */
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static void
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ld_canvas_real_cancel_operation (LdCanvas *self)
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{
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g_return_if_fail (LD_IS_CANVAS (self));
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if (self->priv->operation)
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{
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if (self->priv->operation_end)
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self->priv->operation_end (self);
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self->priv->operation = OPER_0;
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self->priv->operation_end = NULL;
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}
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}
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/**
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* ld_canvas_add_object_begin:
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* @self: An #LdCanvas object.
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* @object: (transfer full): The object to be added to the diagram.
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*
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* Begin an operation for adding an object into the diagram.
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*/
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void
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ld_canvas_add_object_begin (LdCanvas *self, LdDiagramObject *object)
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{
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AddObjectData *data;
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g_return_if_fail (LD_IS_CANVAS (self));
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g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object));
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ld_canvas_real_cancel_operation (self);
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self->priv->operation = OPER_ADD_OBJECT;
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self->priv->operation_end = ld_canvas_add_object_end;
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data = &OPER_DATA (self, add_object);
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data->object = object;
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}
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static void
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ld_canvas_add_object_end (LdCanvas *self)
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{
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AddObjectData *data;
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data = &OPER_DATA (self, add_object);
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if (data->object)
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{
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queue_object_redraw (self, data->object);
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g_object_unref (data->object);
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data->object = NULL;
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}
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}
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/* ===== Events, rendering ================================================= */
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static void
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move_object_to_widget_coords (LdCanvas *self, LdDiagramObject *object,
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gdouble x, gdouble y)
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{
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gdouble dx, dy;
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ld_canvas_widget_to_diagram_coords (self, x, y, &dx, &dy);
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ld_diagram_object_set_x (object, floor (dx + 0.5));
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ld_diagram_object_set_y (object, floor (dy + 0.5));
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}
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static LdSymbol *
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resolve_diagram_symbol (LdCanvas *self, LdDiagramSymbol *diagram_symbol)
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{
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@ -606,6 +754,98 @@ get_symbol_clip_area_on_widget (LdCanvas *self, LdDiagramSymbol *diagram_symbol,
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return TRUE;
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}
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static void
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queue_object_redraw (LdCanvas *self, LdDiagramObject *object)
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{
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if (LD_IS_DIAGRAM_SYMBOL (object))
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{
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gdouble x, y, width, height;
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if (!get_symbol_clip_area_on_widget (self, LD_DIAGRAM_SYMBOL (object),
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&x, &y, &width, &height))
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return;
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gtk_widget_queue_draw_area (GTK_WIDGET (self),
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floor (x), floor (y), ceil (width), ceil (height));
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}
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}
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static gboolean
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on_motion_notify (GtkWidget *widget, GdkEventMotion *event, gpointer user_data)
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{
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LdCanvas *self;
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self = LD_CANVAS (widget);
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switch (self->priv->operation)
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{
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AddObjectData *data;
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case OPER_ADD_OBJECT:
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data = &OPER_DATA (self, add_object);
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data->visible = TRUE;
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queue_object_redraw (self, data->object);
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move_object_to_widget_coords (self, data->object, event->x, event->y);
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queue_object_redraw (self, data->object);
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break;
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}
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return FALSE;
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}
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static gboolean
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on_leave_notify (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data)
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{
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LdCanvas *self;
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self = LD_CANVAS (widget);
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switch (self->priv->operation)
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{
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AddObjectData *data;
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case OPER_ADD_OBJECT:
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data = &OPER_DATA (self, add_object);
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data->visible = FALSE;
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queue_object_redraw (self, data->object);
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break;
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}
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return FALSE;
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}
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static gboolean
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on_button_press (GtkWidget *widget, GdkEventButton *event, gpointer user_data)
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{
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LdCanvas *self;
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if (!gtk_widget_has_focus (widget))
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gtk_widget_grab_focus (widget);
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self = LD_CANVAS (widget);
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switch (self->priv->operation)
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{
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AddObjectData *data;
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case OPER_ADD_OBJECT:
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data = &OPER_DATA (self, add_object);
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queue_object_redraw (self, data->object);
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move_object_to_widget_coords (self, data->object, event->x, event->y);
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if (self->priv->diagram)
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ld_diagram_insert_object (self->priv->diagram, data->object, -1);
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/* XXX: "cancel" causes confusion. */
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ld_canvas_real_cancel_operation (self);
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break;
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}
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return FALSE;
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}
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static gboolean
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on_button_release (GtkWidget *widget, GdkEventButton *event, gpointer user_data)
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{
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return FALSE;
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}
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static gboolean
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on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
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{
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@ -680,6 +920,17 @@ draw_diagram (GtkWidget *widget, DrawData *data)
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objects = ld_diagram_get_objects (data->self->priv->diagram);
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g_slist_foreach (objects, (GFunc) draw_object, data);
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switch (data->self->priv->operation)
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{
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AddObjectData *op_data;
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case OPER_ADD_OBJECT:
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op_data = &OPER_DATA (data->self, add_object);
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if (op_data->visible)
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draw_object (op_data->object, data);
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break;
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}
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cairo_restore (data->cr);
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}
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@ -48,8 +48,11 @@ struct _LdCanvasClass
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/*< private >*/
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GtkDrawingAreaClass parent_class;
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guint cancel_operation_signal;
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void (*set_scroll_adjustments) (LdCanvas *self,
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GtkAdjustment *horizontal, GtkAdjustment *vertical);
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void (*cancel_operation) (LdCanvas *self);
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};
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@ -75,6 +78,8 @@ void ld_canvas_widget_to_diagram_coords (LdCanvas *self,
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void ld_canvas_diagram_to_widget_coords (LdCanvas *self,
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gdouble dx, gdouble dy, gdouble *wx, gdouble *wy);
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void ld_canvas_add_object_begin (LdCanvas *self, LdDiagramObject *object);
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/* TODO: The rest of the interface. */
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@ -761,7 +761,25 @@ on_canvas_button_release (GtkWidget *widget, GdkEventButton *event,
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if (event->button != 1)
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return FALSE;
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/* TODO: Add the selected symbol into the document on the position. */
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if (data->active_item != -1)
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{
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LdDiagramSymbol *symbol;
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const gchar *category_name, *symbol_name;
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gchar *klass;
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category_name = ld_symbol_category_get_name
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(g_object_get_data (G_OBJECT (data->active_button), "category"));
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symbol_name = ld_symbol_get_name
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(data->items[data->active_item].symbol);
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klass = g_build_path (LD_LIBRARY_IDENTIFIER_SEPARATOR,
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category_name, symbol_name, NULL);
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symbol = ld_diagram_symbol_new (klass);
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g_free (klass);
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ld_canvas_add_object_begin (self->priv->canvas,
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LD_DIAGRAM_OBJECT (symbol));
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}
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/* We've either chosen a symbol or canceled the menu, so hide it. */
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if (data->active_button)
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