{
private string[] list;
protected int cur_el;
+ protected double distortion_factor;
+
+ // Number of items shown before and after the focus element
+ protected int focus_first;
+ protected int focus_end;
+ protected int focus_size;
+ protected double[] focus_starts;
+ protected bool focus_locked;
+ protected double focus_centre;
public FisheyeList()
{
for (int i = 0; i < 300; ++i)
list[i] = "Antani %d".printf(i);
- cur_el = 50;
+ cur_el = 0;
+ focus_centre = 0.0;
+ focus_size = 20;
+ focus_starts = new double[focus_size + 1];
+ focus_locked = false;
+ distortion_factor = 30;
+ focus_layout();
add_events(Gdk.EventMask.POINTER_MOTION_MASK
| Gdk.EventMask.BUTTON_PRESS_MASK
/* Mouse button got pressed over widget */
public override bool button_press_event(Gdk.EventButton event)
{
- // ...
+ stderr.printf("Mouse pressed on %d %s\n", cur_el, list[cur_el]);
return false;
}
/* Mouse button got released */
public override bool button_release_event(Gdk.EventButton event)
{
+ stderr.printf("Mouse released on %d %s\n", cur_el, list[cur_el]);
// ...
return false;
}
/* Mouse pointer moved over widget */
public override bool motion_notify_event(Gdk.EventMotion event)
{
- cur_el = (int)Math.round(event.y * list.length / allocation.height);
- stderr.printf("MOTION %f %f CE %d\n", event.x, event.y, cur_el);
- queue_draw();
+ int old_cur_el = cur_el;
+ double x = event.x / allocation.width;
+ double y = event.y / allocation.height;
+
+ focus_locked = x > 0.5 && y >= focus_starts[0] && y < focus_starts[focus_end - focus_first];
+
+ if (focus_locked)
+ {
+ for (int idx = focus_first; idx < focus_end; ++idx)
+ if (y < focus_starts[idx-focus_first+1])
+ {
+ cur_el = idx;
+ break;
+ }
+
+ } else {
+ cur_el = (int)Math.round(y * list.length);
+ if (old_cur_el != cur_el)
+ focus_layout();
+ }
+
+ //stderr.printf("MOTION %f %f CE %d\n", event.x, event.y, cur_el);
+ if (old_cur_el != cur_el)
+ {
+ queue_draw();
+ old_cur_el = cur_el;
+ }
return false;
}
{
double layout_min = 0;
double layout_max = 1;
- double distortion_factor = 30;
- // Anchor point
- double anchor = (double)cur_el/list.length;
// Undistorted Y
double undy = (double)idx/list.length;
// Distorted position
- double pos = fisheye(undy, anchor, distortion_factor, layout_min, layout_max);
+ double pos = fisheye(undy, focus_centre, distortion_factor, layout_min, layout_max);
//stderr.printf("%d %f %f\n", idx, undy, pos);
return pos;
}
+ protected void focus_layout()
+ {
+ // Anchor point
+ focus_centre = (double)cur_el/list.length;
+
+ focus_first = cur_el > focus_size/2 ? cur_el-focus_size/2 : 0;
+ focus_end = focus_first + focus_size;
+ if (focus_end >= list.length) focus_end = list.length;
+
+ // Compute starting positions for all items in focus
+ for (int idx = focus_first; idx < focus_end; ++idx)
+ {
+ double posprev = idx == 0 ? 0 : el_y(idx-1);
+ double pos = el_y(idx);
+ double posnext = idx == list.length-1 ? 1 : el_y(idx+1);
+ double y0 = (pos+posprev)/2;
+ double y1 = (pos+posnext)/2;
+
+ focus_starts[idx - focus_first] = y0;
+ focus_starts[idx - focus_first + 1] = y1;
+ }
+ }
+
protected void draw(Cairo.Context context)
{
+ // White background (FIXME: get from style)
context.set_source_rgb(1, 1, 1);
context.paint();
context.set_source_rgb(0, 0, 0);
+ // Normalise coordinates
context.translate (0, 0);
context.scale(allocation.width, allocation.height);
-
- // Layout items
- // item_pos(idx) = idx/list.length
-
+ // Paint items around focus
context.set_line_width (0.001);
context.select_font_face("Sans", Cairo.FontSlant.NORMAL, Cairo.FontWeight.NORMAL);
- int start = cur_el > 20 ? cur_el-20 : 0;
- int end = cur_el < list.length - 20 ? cur_el + 20 : list.length;
- for (int idx = start; idx < end; ++idx)
+ for (int idx = focus_first; idx < focus_end; ++idx)
{
- double posprev = idx == 0 ? 0 : el_y(idx-1);
- double pos = el_y(idx);
- double posnext = idx == list.length-1 ? 1 : el_y(idx+1);
- double y0 = (pos+posprev)/2;
- double y1 = (pos+posnext)/2;
+ double y0 = focus_starts[idx - focus_first];
+ double y1 = focus_starts[idx - focus_first + 1];
- //stderr.printf(" %f->%f (%f)\n", y0, y1, y1-y0);
-
- context.set_source_rgba(idx%2, 1-idx%2, 0, 1);
- context.new_path();
- context.rectangle(0, y0, 1, y1-y0);
- context.fill();
- context.stroke();
+ if (idx == cur_el)
+ {
+ context.set_source_rgba(0.4, 0.4, 1, 1);
+ context.new_path();
+ context.rectangle(0, y0, 1, y1-y0);
+ context.fill();
+ context.stroke();
+ }
context.set_source_rgba(0, 0, 0, 1);
context.new_path();
- context.move_to(0, pos);
+ context.move_to(0, (y1+y0)/2);
context.set_font_size(y1-y0);
context.text_path(list[idx]);
context.fill();
context.stroke();
}
+
+ // Paint focus lock area
+ context.set_source_rgba(0.8, 1, 1, 0.8);
+ context.new_path();
+ context.rectangle(0.5, focus_starts[0], 1, focus_starts[focus_end - focus_first]);
+ context.fill();
+ context.stroke();
}
/*