*: add source from drawing example and using gtk builder
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
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12
Makefile
12
Makefile
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@ -3,6 +3,18 @@ CFLAGS ?= -Wall -g $(shell pkg-config --cflags gtk4)
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LDFLAGS ?= $(shell pkg-config --libs gtk4)
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LDFLAGS ?= $(shell pkg-config --libs gtk4)
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CLEANFILES :=
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CLEANFILES :=
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all: main example-3 example-4
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example-3: example-3.c
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gcc $(CFLAGS) -o $@ $< $(LDFLAGS)
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CLEANFILES += example-3
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example-4: example-4.c
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gcc $(CFLAGS) -o $@ $< $(LDFLAGS)
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CLEANFILES += example-4
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main: main.c
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main: main.c
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gcc $(CFLAGS) -o $@ $< $(LDFLAGS)
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gcc $(CFLAGS) -o $@ $< $(LDFLAGS)
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38
builder.ui
Normal file
38
builder.ui
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@ -0,0 +1,38 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<interface>
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<object id="window" class="GtkWindow">
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<property name="title">Grid</property>
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<child>
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<object id="grid" class="GtkGrid">
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<child>
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<object id="button1" class="GtkButton">
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<property name="label">Button 1</property>
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<layout>
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<property name="column">0</property>
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<property name="row">0</property>
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</layout>
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</object>
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</child>
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<child>
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<object id="button2" class="GtkButton">
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<property name="label">Button 2</property>
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<layout>
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<property name="column">1</property>
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<property name="row">0</property>
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</layout>
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</object>
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</child>
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<child>
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<object id="quit" class="GtkButton">
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<property name="label">Quit</property>
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<layout>
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<property name="column">0</property>
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<property name="row">1</property>
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<property name="column-span">2</property>
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</layout>
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</object>
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</child>
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</object>
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</child>
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</object>
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</interface>
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187
example-3.c
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187
example-3.c
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@ -0,0 +1,187 @@
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#include <gtk/gtk.h>
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/* Surface to store current scribbles */
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static cairo_surface_t *surface = NULL;
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static void
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clear_surface (void)
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{
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cairo_t *cr;
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cr = cairo_create (surface);
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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cairo_destroy (cr);
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}
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/* Create a new surface of the appropriate size to store our scribbles */
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static void
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resize_cb (GtkWidget *widget,
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int width,
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int height,
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gpointer data)
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{
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if (surface)
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{
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cairo_surface_destroy (surface);
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surface = NULL;
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}
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if (gtk_native_get_surface (gtk_widget_get_native (widget)))
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{
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surface = gdk_surface_create_similar_surface (gtk_native_get_surface (gtk_widget_get_native (widget)),
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CAIRO_CONTENT_COLOR,
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gtk_widget_get_width (widget),
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gtk_widget_get_height (widget));
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/* Initialize the surface to white */
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clear_surface ();
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}
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}
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/* Redraw the screen from the surface. Note that the draw
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* callback receives a ready-to-be-used cairo_t that is already
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* clipped to only draw the exposed areas of the widget
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*/
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static void
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draw_cb (GtkDrawingArea *drawing_area,
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cairo_t *cr,
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int width,
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int height,
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gpointer data)
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{
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_paint (cr);
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}
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/* Draw a rectangle on the surface at the given position */
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static void
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draw_brush (GtkWidget *widget,
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double x,
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double y)
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{
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cairo_t *cr;
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/* Paint to the surface, where we store our state */
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cr = cairo_create (surface);
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cairo_rectangle (cr, x - 3, y - 3, 6, 6);
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cairo_fill (cr);
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cairo_destroy (cr);
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/* Now invalidate the drawing area. */
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gtk_widget_queue_draw (widget);
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}
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static double start_x;
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static double start_y;
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static void
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drag_begin (GtkGestureDrag *gesture,
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double x,
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double y,
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GtkWidget *area)
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{
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start_x = x;
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start_y = y;
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draw_brush (area, x, y);
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}
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static void
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drag_update (GtkGestureDrag *gesture,
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double x,
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double y,
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GtkWidget *area)
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{
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draw_brush (area, start_x + x, start_y + y);
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}
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static void
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drag_end (GtkGestureDrag *gesture,
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double x,
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double y,
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GtkWidget *area)
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{
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draw_brush (area, start_x + x, start_y + y);
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}
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static void
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pressed (GtkGestureClick *gesture,
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int n_press,
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double x,
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double y,
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GtkWidget *area)
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{
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clear_surface ();
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gtk_widget_queue_draw (area);
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}
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static void
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close_window (void)
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{
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if (surface)
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cairo_surface_destroy (surface);
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}
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static void
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activate (GtkApplication *app,
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gpointer user_data)
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{
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GtkWidget *window;
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GtkWidget *frame;
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GtkWidget *drawing_area;
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GtkGesture *drag;
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GtkGesture *press;
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window = gtk_application_window_new (app);
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gtk_window_set_title (GTK_WINDOW (window), "Drawing Area");
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g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);
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frame = gtk_frame_new (NULL);
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gtk_window_set_child (GTK_WINDOW (window), frame);
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drawing_area = gtk_drawing_area_new ();
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/* set a minimum size */
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gtk_widget_set_size_request (drawing_area, 100, 100);
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gtk_frame_set_child (GTK_FRAME (frame), drawing_area);
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gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (drawing_area), draw_cb, NULL, NULL);
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g_signal_connect_after (drawing_area, "resize", G_CALLBACK (resize_cb), NULL);
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drag = gtk_gesture_drag_new ();
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gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (drag), GDK_BUTTON_PRIMARY);
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gtk_widget_add_controller (drawing_area, GTK_EVENT_CONTROLLER (drag));
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g_signal_connect (drag, "drag-begin", G_CALLBACK (drag_begin), drawing_area);
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g_signal_connect (drag, "drag-update", G_CALLBACK (drag_update), drawing_area);
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g_signal_connect (drag, "drag-end", G_CALLBACK (drag_end), drawing_area);
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press = gtk_gesture_click_new ();
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gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (press), GDK_BUTTON_SECONDARY);
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gtk_widget_add_controller (drawing_area, GTK_EVENT_CONTROLLER (press));
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g_signal_connect (press, "pressed", G_CALLBACK (pressed), drawing_area);
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gtk_window_present (GTK_WINDOW (window));
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}
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int
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main (int argc,
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char **argv)
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{
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GtkApplication *app;
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int status;
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app = gtk_application_new ("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
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g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
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status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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}
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59
example-4.c
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59
example-4.c
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#include <gtk/gtk.h>
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#include <glib/gstdio.h>
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static void
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print_hello (GtkWidget *widget,
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gpointer data)
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{
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g_print ("Hello World\n");
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}
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static void
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quit_cb (GtkWindow *window)
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{
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gtk_window_close (window);
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}
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static void
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activate (GtkApplication *app,
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gpointer user_data)
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{
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/* Construct a GtkBuilder instance and load our UI description */
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GtkBuilder *builder = gtk_builder_new ();
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gtk_builder_add_from_file (builder, "builder.ui", NULL);
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/* Connect signal handlers to the constructed widgets. */
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GObject *window = gtk_builder_get_object (builder, "window");
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gtk_window_set_application (GTK_WINDOW (window), app);
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GObject *button = gtk_builder_get_object (builder, "button1");
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g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
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button = gtk_builder_get_object (builder, "button2");
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g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
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button = gtk_builder_get_object (builder, "quit");
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g_signal_connect_swapped (button, "clicked", G_CALLBACK (quit_cb), window);
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gtk_widget_set_visible (GTK_WIDGET (window), TRUE);
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/* We do not need the builder any more */
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g_object_unref (builder);
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}
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int
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main (int argc,
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char *argv[])
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{
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#ifdef GTK_SRCDIR
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g_chdir (GTK_SRCDIR);
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#endif
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GtkApplication *app = gtk_application_new ("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
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g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
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int status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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}
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