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gtk-demo: Add pad controller handling to "Paint" demo

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So it's more lifelike.
This commit is contained in:
Carlos Garnacho 2018-06-26 22:15:27 +02:00
parent 6d3eb18578
commit 101c927c40
1 changed files with 133 additions and 5 deletions
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138
demos/gtk-demo/paint.c
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@ -3,14 +3,24 @@
* Demonstrates practical handling of drawing tablets in a real world
* usecase.
*/
#include <glib/gi18n.h>
#include <gtk/gtk.h>
enum {
COLOR_SET,
N_SIGNALS
};
static guint area_signals[N_SIGNALS] = { 0, };
typedef struct
{
GtkWidget parent_instance;
cairo_surface_t *surface;
cairo_t *cr;
GdkRGBA draw_color;
GtkPadController *pad_controller;
gdouble brush_size;
} DrawingArea;
typedef struct
@ -18,8 +28,30 @@ typedef struct
GtkWidgetClass parent_class;
} DrawingAreaClass;
static GtkPadActionEntry pad_actions[] = {
{ GTK_PAD_ACTION_BUTTON, 1, -1, N_("Black"), "pad.black" },
{ GTK_PAD_ACTION_BUTTON, 2, -1, N_("Pink"), "pad.pink" },
{ GTK_PAD_ACTION_BUTTON, 3, -1, N_("Green"), "pad.green" },
{ GTK_PAD_ACTION_BUTTON, 4, -1, N_("Red"), "pad.red" },
{ GTK_PAD_ACTION_BUTTON, 5, -1, N_("Purple"), "pad.purple" },
{ GTK_PAD_ACTION_BUTTON, 6, -1, N_("Orange"), "pad.orange" },
{ GTK_PAD_ACTION_STRIP, -1, -1, N_("Brush size"), "pad.brush_size" },
};
static const gchar *pad_colors[] = {
"black",
"pink",
"green",
"red",
"purple",
"orange"
};
G_DEFINE_TYPE (DrawingArea, drawing_area, GTK_TYPE_WIDGET)
static void drawing_area_set_color (DrawingArea *area,
GdkRGBA *color);
static void
drawing_area_ensure_surface (DrawingArea *area,
gint width,
@ -115,6 +147,82 @@ drawing_area_snapshot (GtkWidget *widget,
cairo_destroy (cr);
}
static void
on_pad_button_activate (GSimpleAction *action,
GVariant *parameter,
DrawingArea *area)
{
const gchar *color = g_object_get_data (G_OBJECT (action), "color");
GdkRGBA rgba;
gdk_rgba_parse (&rgba, color);
drawing_area_set_color (area, &rgba);
}
static void
on_pad_knob_change (GSimpleAction *action,
GVariant *parameter,
DrawingArea *area)
{
gdouble value = g_variant_get_double (parameter);
area->brush_size = value;
}
static void
drawing_area_hierarchy_changed (GtkWidget *widget,
GtkWidget *previous_toplevel)
{
DrawingArea *area = (DrawingArea *) widget;
GSimpleActionGroup *action_group;
GSimpleAction *action;
GtkWidget *toplevel;
gint i;
if (previous_toplevel && area->pad_controller)
{
gtk_widget_remove_controller (previous_toplevel,
GTK_EVENT_CONTROLLER (area->pad_controller));
area->pad_controller = NULL;
}
toplevel = gtk_widget_get_toplevel (GTK_WIDGET (area));
if (!GTK_IS_WINDOW (toplevel))
return;
action_group = g_simple_action_group_new ();
area->pad_controller = gtk_pad_controller_new (G_ACTION_GROUP (action_group),
NULL);
for (i = 0; i < G_N_ELEMENTS (pad_actions); i++)
{
if (pad_actions[i].type == GTK_PAD_ACTION_BUTTON)
{
action = g_simple_action_new (pad_actions[i].action_name, NULL);
g_object_set_data (G_OBJECT (action), "color",
(gpointer) pad_colors[i]);
g_signal_connect (action, "activate",
G_CALLBACK (on_pad_button_activate), area);
}
else
{
action = g_simple_action_new_stateful (pad_actions[i].action_name,
G_VARIANT_TYPE_DOUBLE, NULL);
g_signal_connect (action, "activate",
G_CALLBACK (on_pad_knob_change), area);
}
g_action_map_add_action (G_ACTION_MAP (action_group), G_ACTION (action));
g_object_unref (action);
}
gtk_pad_controller_set_action_entries (area->pad_controller, pad_actions,
G_N_ELEMENTS (pad_actions));
gtk_widget_add_controller (toplevel,
GTK_EVENT_CONTROLLER (area->pad_controller));
}
static void
drawing_area_class_init (DrawingAreaClass *klass)
{
@ -124,6 +232,14 @@ drawing_area_class_init (DrawingAreaClass *klass)
widget_class->snapshot = drawing_area_snapshot;
widget_class->map = drawing_area_map;
widget_class->unmap = drawing_area_unmap;
widget_class->hierarchy_changed = drawing_area_hierarchy_changed;
area_signals[COLOR_SET] =
g_signal_new ("color-set",
G_TYPE_FROM_CLASS (widget_class),
G_SIGNAL_RUN_FIRST,
0, NULL, NULL, NULL,
G_TYPE_NONE, 1, GDK_TYPE_RGBA);
}
static void
@ -135,12 +251,12 @@ drawing_area_apply_stroke (DrawingArea *area,
{
if (gdk_device_tool_get_tool_type (tool) == GDK_DEVICE_TOOL_TYPE_ERASER)
{
cairo_set_line_width (area->cr, 10 * pressure);
cairo_set_line_width (area->cr, 10 * pressure * area->brush_size);
cairo_set_operator (area->cr, CAIRO_OPERATOR_DEST_OUT);
}
else
{
cairo_set_line_width (area->cr, 4 * pressure);
cairo_set_line_width (area->cr, 4 * pressure * area->brush_size);
cairo_set_operator (area->cr, CAIRO_OPERATOR_SATURATE);
}
@ -148,8 +264,6 @@ drawing_area_apply_stroke (DrawingArea *area,
area->draw_color.green, area->draw_color.blue,
area->draw_color.alpha * pressure);
//cairo_set_source_rgba (area->cr, 0, 0, 0, pressure);
cairo_line_to (area->cr, x, y);
cairo_stroke (area->cr);
cairo_move_to (area->cr, x, y);
@ -225,11 +339,15 @@ drawing_area_new (void)
return g_object_new (drawing_area_get_type (), NULL);
}
void
static void
drawing_area_set_color (DrawingArea *area,
GdkRGBA *color)
{
if (gdk_rgba_equal (&area->draw_color, color))
return;
area->draw_color = *color;
g_signal_emit (area, area_signals[COLOR_SET], 0, &area->draw_color);
}
static void
@ -242,6 +360,14 @@ color_button_color_set (GtkColorButton *button,
drawing_area_set_color (draw_area, &color);
}
static void
drawing_area_color_set (DrawingArea *area,
GdkRGBA *color,
GtkColorButton *button)
{
gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (button), color);
}
GtkWidget *
do_paint (GtkWidget *toplevel)
{
@ -263,6 +389,8 @@ do_paint (GtkWidget *toplevel)
colorbutton = gtk_color_button_new ();
g_signal_connect (colorbutton, "color-set",
G_CALLBACK (color_button_color_set), draw_area);
g_signal_connect (draw_area, "color-set",
G_CALLBACK (drawing_area_color_set), colorbutton);
gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (colorbutton),
&(GdkRGBA) { 0, 0, 0, 1 });