mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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286 lines
8.1 KiB
C
286 lines
8.1 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2012 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "fontplane.h"
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enum {
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PROP_0,
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PROP_WEIGHT_ADJUSTMENT,
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PROP_WIDTH_ADJUSTMENT
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};
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G_DEFINE_TYPE (GtkFontPlane, gtk_font_plane, GTK_TYPE_WIDGET)
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static double
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adjustment_get_normalized_value (GtkAdjustment *adj)
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{
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return (gtk_adjustment_get_value (adj) - gtk_adjustment_get_lower (adj)) /
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(gtk_adjustment_get_upper (adj) - gtk_adjustment_get_lower (adj));
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}
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static void
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val_to_xy (GtkFontPlane *plane,
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int *x,
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int *y)
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{
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double u, v;
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int width, height;
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width = gtk_widget_get_allocated_width (GTK_WIDGET (plane));
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height = gtk_widget_get_allocated_height (GTK_WIDGET (plane));
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u = adjustment_get_normalized_value (plane->width_adj);
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v = adjustment_get_normalized_value (plane->weight_adj);
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*x = CLAMP (width * u, 0, width - 1);
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*y = CLAMP (height * (1 - v), 0, height - 1);
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}
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static void
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plane_snapshot (GtkWidget *widget,
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GtkSnapshot *snapshot)
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{
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GtkFontPlane *plane = GTK_FONT_PLANE (widget);
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int x, y;
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int width, height;
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cairo_t *cr;
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val_to_xy (plane, &x, &y);
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width = gtk_widget_get_allocated_width (widget);
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height = gtk_widget_get_allocated_height (widget);
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cr = gtk_snapshot_append_cairo (snapshot,
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&GRAPHENE_RECT_INIT (0, 0, width, height));
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_rectangle (cr, 0, 0, width, height);
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cairo_paint (cr);
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cairo_move_to (cr, 0, y + 0.5);
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cairo_line_to (cr, width, y + 0.5);
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cairo_move_to (cr, x + 0.5, 0);
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cairo_line_to (cr, x + 0.5, height);
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if (gtk_widget_has_visible_focus (widget))
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{
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cairo_set_line_width (cr, 3.0);
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cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
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cairo_stroke_preserve (cr);
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cairo_set_line_width (cr, 1.0);
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cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
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cairo_stroke (cr);
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}
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else
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{
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cairo_set_line_width (cr, 1.0);
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cairo_set_source_rgba (cr, 0.8, 0.8, 0.8, 0.8);
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cairo_stroke (cr);
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}
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cairo_destroy (cr);
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}
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static void
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set_cross_cursor (GtkWidget *widget,
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gboolean enabled)
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{
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if (enabled)
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gtk_widget_set_cursor_from_name (widget, "crosshair");
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else
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gtk_widget_set_cursor (widget, NULL);
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}
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static void
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adj_changed (GtkFontPlane *plane)
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{
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gtk_widget_queue_draw (GTK_WIDGET (plane));
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}
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static void
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adjustment_set_normalized_value (GtkAdjustment *adj,
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double val)
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{
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gtk_adjustment_set_value (adj,
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gtk_adjustment_get_lower (adj) +
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val * (gtk_adjustment_get_upper (adj) - gtk_adjustment_get_lower (adj)));
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}
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static void
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update_value (GtkFontPlane *plane,
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int x,
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int y)
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{
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GtkWidget *widget = GTK_WIDGET (plane);
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double u, v;
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u = CLAMP (x * (1.0 / gtk_widget_get_allocated_width (widget)), 0, 1);
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v = CLAMP (1 - y * (1.0 / gtk_widget_get_allocated_height (widget)), 0, 1);
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adjustment_set_normalized_value (plane->width_adj, u);
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adjustment_set_normalized_value (plane->weight_adj, v);
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gtk_widget_queue_draw (widget);
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}
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static void
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plane_drag_gesture_begin (GtkGestureDrag *gesture,
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double start_x,
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double start_y,
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GtkFontPlane *plane)
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{
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guint button;
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button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
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if (button != GDK_BUTTON_PRIMARY)
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{
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gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_DENIED);
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return;
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}
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set_cross_cursor (GTK_WIDGET (plane), TRUE);
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update_value (plane, start_x, start_y);
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gtk_widget_grab_focus (GTK_WIDGET (plane));
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gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
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}
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static void
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plane_drag_gesture_update (GtkGestureDrag *gesture,
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double offset_x,
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double offset_y,
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GtkFontPlane *plane)
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{
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double start_x, start_y;
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gtk_gesture_drag_get_start_point (GTK_GESTURE_DRAG (gesture),
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&start_x, &start_y);
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update_value (plane, start_x + offset_x, start_y + offset_y);
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}
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static void
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plane_drag_gesture_end (GtkGestureDrag *gesture,
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double offset_x,
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double offset_y,
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GtkFontPlane *plane)
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{
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set_cross_cursor (GTK_WIDGET (plane), FALSE);
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}
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static void
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gtk_font_plane_init (GtkFontPlane *plane)
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{
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GtkGesture *gesture;
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gesture = gtk_gesture_drag_new ();
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g_signal_connect (gesture, "drag-begin",
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G_CALLBACK (plane_drag_gesture_begin), plane);
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g_signal_connect (gesture, "drag-update",
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G_CALLBACK (plane_drag_gesture_update), plane);
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g_signal_connect (gesture, "drag-end",
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G_CALLBACK (plane_drag_gesture_end), plane);
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gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), 0);
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gtk_widget_add_controller (GTK_WIDGET (plane), GTK_EVENT_CONTROLLER (gesture));
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}
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static void
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plane_finalize (GObject *object)
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{
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GtkFontPlane *plane = GTK_FONT_PLANE (object);
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g_clear_object (&plane->weight_adj);
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g_clear_object (&plane->width_adj);
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G_OBJECT_CLASS (gtk_font_plane_parent_class)->finalize (object);
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}
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static void
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plane_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkFontPlane *plane = GTK_FONT_PLANE (object);
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GtkAdjustment *adjustment;
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switch (prop_id)
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{
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case PROP_WEIGHT_ADJUSTMENT:
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adjustment = GTK_ADJUSTMENT (g_value_get_object (value));
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if (adjustment)
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{
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plane->weight_adj = g_object_ref_sink (adjustment);
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g_signal_connect_swapped (adjustment, "value-changed", G_CALLBACK (adj_changed), plane);
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}
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break;
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case PROP_WIDTH_ADJUSTMENT:
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adjustment = GTK_ADJUSTMENT (g_value_get_object (value));
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if (adjustment)
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{
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plane->width_adj = g_object_ref_sink (adjustment);
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g_signal_connect_swapped (adjustment, "value-changed", G_CALLBACK (adj_changed), plane);
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}
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_font_plane_class_init (GtkFontPlaneClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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object_class->finalize = plane_finalize;
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object_class->set_property = plane_set_property;
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widget_class->snapshot = plane_snapshot;
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g_object_class_install_property (object_class,
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PROP_WEIGHT_ADJUSTMENT,
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g_param_spec_object ("weight-adjustment",
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NULL,
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NULL,
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GTK_TYPE_ADJUSTMENT,
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G_PARAM_WRITABLE |
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G_PARAM_CONSTRUCT_ONLY));
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g_object_class_install_property (object_class,
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PROP_WIDTH_ADJUSTMENT,
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g_param_spec_object ("width-adjustment",
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NULL,
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NULL,
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GTK_TYPE_ADJUSTMENT,
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G_PARAM_WRITABLE |
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G_PARAM_CONSTRUCT_ONLY));
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}
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GtkWidget *
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gtk_font_plane_new (GtkAdjustment *weight_adj,
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GtkAdjustment *width_adj)
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{
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return g_object_new (GTK_TYPE_FONT_PLANE,
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"weight-adjustment", weight_adj,
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"width-adjustment", width_adj,
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NULL);
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}
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