Added image panning support, refactoring

1 files changed, 146 insertions, 0 deletions

diff --git a/input.c b/input.c
new file mode 100644
index 0000000..1d460d9
--- /dev/null
+++ b/input.c
@@ -0,0 +1,146 @@
+#include "input.h"
+#include "file.h"
+#include "image.h"
+#include "window.h"
+#include <gtk-3.0/gtk/gtk.h>
+
+#define TIMEOUT 20
+
+int grabbed = 0;
+gdouble start_x, start_y;
+
+void next()
+{
+    char *name;
+    if ((name = get_next_file()) != NULL)
+        load_image(name);
+}
+
+void prev()
+{
+    char *name;
+    if ((name = get_prev_file()) != NULL)
+        load_image(name);
+}
+
+void first()
+{
+    char *name;
+    if ((name = get_first_file()) != NULL)
+        load_image(name);
+}
+
+void last()
+{
+    char *name;
+    if ((name = get_last_file()) != NULL)
+        load_image(name);
+}
+
+void handle_key_press(GdkEventKey key)
+{
+    switch (key.keyval) {
+    case GDK_KEY_q:
+        quit();
+    case GDK_KEY_w:
+        fit_image();
+        break;
+    case GDK_KEY_plus:
+    case GDK_KEY_KP_Add:
+        zoom(1);
+        break;
+    case GDK_KEY_minus:
+    case GDK_KEY_KP_Subtract:
+        zoom(-1);
+        break;
+    case GDK_KEY_equal:
+        zoom(0);
+        break;
+    case GDK_KEY_n:
+    case GDK_KEY_j:
+    case GDK_KEY_Right:
+        next();
+        break;
+    case GDK_KEY_p:
+    case GDK_KEY_k:
+    case GDK_KEY_Left:
+        prev();
+        break;
+    case GDK_KEY_g:
+    case GDK_KEY_Home:
+        first();
+        break;
+    case GDK_KEY_G:
+    case GDK_KEY_End:
+        last();
+        break;
+    default:
+        break;
+    }
+}
+
+void handle_button_press(GdkEvent *event)
+{
+    grabbed = 1;
+    start_x = event->motion.x;
+    start_y = event->motion.y;
+}
+
+void handle_button_release()
+{
+    grabbed = 0;
+}
+
+void handle_mouse_move(gdouble x, gdouble y)
+{
+    if (grabbed) {
+        gdouble diff_x = start_x - x;
+        gdouble diff_y = start_y - y;
+        start_x = x;
+        start_y = y;
+        scroll_window(diff_x, diff_y);
+    }
+}
+
+void handle_scroll(GdkEvent *event)
+{
+    GdkModifierType state;
+    gdk_event_get_state(event, &state);
+
+    switch (event->scroll.direction) {
+    case GDK_SCROLL_UP:
+        if (state & GDK_CONTROL_MASK) {
+            zoom(1);
+        } else {
+            prev();
+        }
+        break;
+    case GDK_SCROLL_DOWN:
+        if (state & GDK_CONTROL_MASK) {
+            zoom(-1);
+        } else {
+            next();
+        }
+        break;
+    default:
+        break;
+    }
+}
+
+gboolean resize_done(gpointer data)
+{
+    guint *id = data;
+    *id = 0;
+    fit_image();
+    return FALSE;
+}
+
+void handle_resize()
+{
+    if (curr_scale_mod != fit)
+        return;
+    static guint id = 0;
+    if (id)
+        g_source_remove(id);
+    id = g_timeout_add(TIMEOUT, resize_done, &id);
+}