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authorWerner Almesberger <werner@almesberger.net>2016-08-18 01:45:24 -0300
committerWerner Almesberger <werner@almesberger.net>2016-08-18 01:49:20 -0300
commit07a60ddc211856fc7693cdd3654f53ee3da2be59 (patch)
treec608d41df89c68a3608454be3e5e3ee91aada7df /gui/input.c
parent30d665115a8f7d72f659a1e77b6eb14e727fbe57 (diff)
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eeshow/gui/gui.c: begin moving input (mouse, keyboard) handling to input.c (WIP)
We had input state scattered all over the place. This cleans things up. We also merge the functions of left and (previously) middle button. This breaks history panning.
Diffstat (limited to 'gui/input.c')
-rw-r--r--gui/input.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/gui/input.c b/gui/input.c
new file mode 100644
index 0000000..3b430c3
--- /dev/null
+++ b/gui/input.c
@@ -0,0 +1,288 @@
+/*
+ * gui/input.c - Input operations
+ *
+ * Written 2016 by Werner Almesberger
+ * Copyright 2016 by Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stddef.h>
+#include <stdbool.h>
+#include <math.h>
+#include <assert.h>
+
+#include <gtk/gtk.h>
+
+#include "misc/util.h"
+#include "gui/input.h"
+
+
+#define DRAG_RADIUS 5
+
+
+static struct input {
+ const struct input_ops *ops;
+ void *user;
+
+ enum state {
+ input_normal,
+ input_clicking,
+ input_ignoring, /* click rejected by moving the cursor */
+ input_hovering,
+ input_dragging,
+ } state;
+
+ struct input *next;
+} *sp = NULL;
+
+static int curr_x, curr_y; /* last mouse position */
+static int clicked_x, clicked_y; /* button down position */
+
+
+/* ----- Mouse button ------------------------------------------------------ */
+
+
+static gboolean motion_notify_event(GtkWidget *widget, GdkEventMotion *event,
+ gpointer data)
+{
+ const struct input *old_sp = sp;
+
+ curr_x = event->x;
+ curr_y = event->y;
+
+ if (!sp)
+ return TRUE;
+
+ switch (sp->state) {
+ case input_normal:
+ if (sp->ops->hover_begin &&
+ sp->ops->hover_begin(sp->user, event->x, event->y))
+ sp->state = input_hovering;
+ assert(sp == old_sp);
+ break;
+ case input_clicking:
+ if (hypot(event->x - clicked_x, event->y - clicked_y) <
+ DRAG_RADIUS)
+ break;
+ if (sp->ops->drag_begin &&
+ sp->ops->drag_begin(sp->user, clicked_x, clicked_y))
+ sp->state = input_dragging;
+ else
+ sp->state = input_ignoring;
+ assert(sp == old_sp);
+ break;
+ case input_ignoring:
+ break;
+ case input_hovering:
+ if (!sp->ops->hover_update)
+ break;
+
+ /* Caution: hover_update may switch input layers */
+ if (sp->ops->hover_update(sp->user, event->x, event->y) &&
+ sp == old_sp) {
+ sp->state = input_normal;
+ if (sp->ops->hover_end)
+ sp->ops->hover_end(sp->user);
+ }
+ break;
+ case input_dragging:
+ if (sp->ops->drag_move)
+ sp->ops->drag_move(sp->user,
+ event->x - clicked_x, event->y - clicked_y);
+ clicked_x = event->x;
+ clicked_y = event->y;
+ break;
+ default:
+ abort();
+ }
+ return TRUE;
+}
+
+
+static gboolean button_press_event(GtkWidget *widget, GdkEventButton *event,
+ gpointer data)
+{
+ const struct input *old_sp = sp;
+
+ if (event->button != 1)
+ return TRUE;
+
+ switch (sp->state) {
+ case input_normal:
+ sp->state = input_clicking;
+ clicked_x = event->x;
+ clicked_y = event->y;
+ break;
+ case input_clicking:
+ case input_ignoring:
+ case input_dragging:
+ /* ignore double-click */
+ break;
+ case input_hovering:
+ if (sp->ops->hover_click &&
+ sp->ops->hover_click(sp->user, event->x, event->y) &&
+ sp == old_sp) {
+ sp->state = input_ignoring;
+ if (sp->ops->hover_end)
+ sp->ops->hover_end(sp->user);
+ }
+ break;
+ default:
+ abort();
+ }
+
+ return TRUE;
+}
+
+
+static gboolean button_release_event(GtkWidget *widget, GdkEventButton *event,
+ gpointer data)
+{
+ if (event->button != 1)
+ return TRUE;
+
+ switch (sp->state) {
+ case input_normal:
+ abort();
+ case input_clicking:
+ sp->state = input_normal;
+ if (sp->ops->click)
+ sp->ops->click(sp->user, clicked_x, clicked_y);
+ break;
+ case input_ignoring:
+ sp->state = input_normal;
+ break;
+ case input_dragging:
+ sp->state = input_normal;
+ if (sp->ops->drag_end)
+ sp->ops->drag_end(sp->user);
+ break;
+ case input_hovering:
+ break;
+ default:
+ abort();
+ }
+
+ return TRUE;
+}
+
+
+/* ----- Scroll wheel ------------------------------------------------------ */
+
+
+static gboolean scroll_event(GtkWidget *widget, GdkEventScroll *event,
+ gpointer data)
+{
+ if (!sp || !sp->ops->scroll)
+ return TRUE;
+ switch (event->direction) {
+ case GDK_SCROLL_UP:
+ sp->ops->scroll(sp->user, event->x, event->y, -1);
+ break;
+ case GDK_SCROLL_DOWN:
+ sp->ops->scroll(sp->user, event->x, event->y, 1);
+ break;
+ default:
+ /* ignore */;
+ }
+ return TRUE;
+}
+
+
+/* ----- Keys -------------------------------------------------------------- */
+
+
+static gboolean key_press_event(GtkWidget *widget, GdkEventKey *event,
+ gpointer data)
+{
+ if (sp && sp->ops->key)
+ sp->ops->key(sp->user, curr_x, curr_y, event->keyval);
+ return TRUE;
+}
+
+
+/* ----- Covenience function for hover_begin and drag_begin ---------------- */
+
+
+bool input_accept(void *user, int x, int y)
+{
+ return 1;
+}
+
+
+/* ----- Adding/removing interaction layers -------------------------------- */
+
+
+static void cleanup(void)
+{
+ if (!sp)
+ return;
+
+ switch (sp->state) {
+ case input_hovering:
+ if (sp->ops->hover_end)
+ sp->ops->hover_end(sp->user);
+ break;
+ case input_dragging:
+ if (sp->ops->drag_end)
+ sp->ops->drag_end(sp->user);
+ break;
+ default:
+ ;
+ }
+}
+
+
+void input_push(const struct input_ops *ops, void *user)
+{
+ struct input *new;
+
+ cleanup();
+
+ new = alloc_type(struct input);
+ new->ops = ops;
+ new->user = user;
+ new->state = input_normal;
+ new->next = sp;
+ sp = new;
+}
+
+
+void input_pop(void)
+{
+ struct input *next = sp->next;
+
+ cleanup();
+ free(sp);
+ sp = next;
+}
+
+
+/* ----- Initialization ---------------------------------------------------- */
+
+
+void input_setup(GtkWidget *da)
+{
+ gtk_widget_set_can_focus(da, TRUE);
+
+ gtk_widget_add_events(da,
+ GDK_KEY_PRESS_MASK |
+ GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
+ GDK_SCROLL_MASK |
+ GDK_POINTER_MOTION_MASK);
+
+ g_signal_connect(G_OBJECT(da), "key_press_event",
+ G_CALLBACK(key_press_event), NULL);
+ g_signal_connect(G_OBJECT(da), "motion_notify_event",
+ G_CALLBACK(motion_notify_event), NULL);
+ g_signal_connect(G_OBJECT(da), "button_press_event",
+ G_CALLBACK(button_press_event), NULL);
+ g_signal_connect(G_OBJECT(da), "button_release_event",
+ G_CALLBACK(button_release_event), NULL);
+ g_signal_connect(G_OBJECT(da), "scroll_event",
+ G_CALLBACK(scroll_event), NULL);
+}