public class FisheyeList : Gtk.DrawingArea
{
+ protected Gtk.TreeModel model;
protected Gdk.Pixmap backing_store;
- private string[] list;
- protected int cur_el;
- protected double distortion_factor;
-
+ // Pango layouts cached for speed
+ protected const int max_font_size = 30;
protected Pango.Layout[] pango_cache;
- // Number of items shown before and after the focus element
+ // Labels to show, extracted from the model
+ protected string[] label_cache;
+ protected bool build_label_cache_needed;
+
+ protected int cur_el;
+
+ // Layout information
protected int focus_first;
protected int focus_end;
- protected int focus_size;
protected int[] focus_starts;
protected bool focus_locked;
- protected int focus_centre;
+ protected bool focus_layout_needed;
+
+ protected int _focus_size;
+ public int focus_size {
+ get { return _focus_size; }
+ set {
+ _focus_size = value;
+ focus_starts = new int[value+1];
+ focus_layout_needed = true;
+ queue_draw();
+ }
+ }
+
+ protected int _label_column;
+ public int label_column {
+ get { return _label_column; }
+ set {
+ _label_column = value;
+ build_label_cache_needed = true;
+ queue_draw();
+ }
+ }
+
+ //public virtual signal void cursor_changed ();
+ public signal void row_activated(Gtk.TreePath path);
public FisheyeList()
{
+ model = null;
backing_store = null;
- list = new string[300];
- for (int i = 0; i < 300; ++i)
- list[i] = "Lorem Ipsum %d".printf(i);
+ label_cache = null;
- pango_cache = new Pango.Layout[30];
- for (int i = 0; i < 30; ++i)
+ pango_cache = new Pango.Layout[max_font_size];
+ for (int i = 0; i < pango_cache.length; ++i)
pango_cache[i] = null;
- cur_el = 0;
- focus_centre = 0;
+ // Defaults for properties
focus_size = 20;
- focus_starts = new int[focus_size + 1];
+ label_column = 0;
+
+ cur_el = 0;
focus_locked = false;
- distortion_factor = 30;
- focus_layout();
add_events(Gdk.EventMask.POINTER_MOTION_MASK
| Gdk.EventMask.BUTTON_PRESS_MASK
| Gdk.EventMask.BUTTON_RELEASE_MASK);
}
+ public unowned Gtk.TreeModel get_model() { return model; }
+ public void set_model (Gtk.TreeModel? model)
+ {
+ if (this.model != null)
+ {
+ this.model.row_changed -= on_row_changed;
+ this.model.row_deleted -= on_row_deleted;
+ this.model.row_has_child_toggled -= on_row_has_child_toggled;
+ this.model.row_inserted -= on_row_inserted;
+ this.model.rows_reordered -= on_rows_reordered;
+ }
+ this.model = model;
+ this.model.row_changed += on_row_changed;
+ this.model.row_deleted += on_row_deleted;
+ this.model.row_has_child_toggled += on_row_has_child_toggled;
+ this.model.row_inserted += on_row_inserted;
+ this.model.rows_reordered += on_rows_reordered;
+ build_label_cache_needed = true;
+ queue_draw();
+ }
+
+ private void on_row_changed(Gtk.TreePath path, Gtk.TreeIter iter) { build_label_cache_needed = true; }
+ private void on_row_deleted(Gtk.TreePath path) { build_label_cache_needed = true; }
+ private void on_row_has_child_toggled(Gtk.TreePath path, Gtk.TreeIter iter) { build_label_cache_needed = true; }
+ private void on_row_inserted(Gtk.TreePath path, Gtk.TreeIter iter) { build_label_cache_needed = true; }
+ private void on_rows_reordered(Gtk.TreePath path, Gtk.TreeIter iter, void* new_order) { build_label_cache_needed = true; }
+
/* 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]);
+ stderr.printf("Mouse pressed on %d %s\n", cur_el, label_cache[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]);
- // ...
+ stderr.printf("Mouse released on %d %s\n", cur_el, label_cache[cur_el]);
+
+ // Emit row_activated if applicable
+ if (model != null)
+ {
+ Gtk.TreeIter iter;
+ if (model.iter_nth_child(out iter, null, cur_el))
+ {
+ Gtk.TreePath path = model.get_path(iter);
+ row_activated(path);
+ }
+ }
return false;
}
int x = (int)event.x;
int y = (int)event.y;
- focus_locked = x < allocation.width/2 && y >= focus_starts[0] && y < focus_starts[focus_end - focus_first];
+ focus_locked = !focus_layout_needed && x < allocation.width/2 && y >= focus_starts[0] && y < focus_starts[focus_end - focus_first];
if (focus_locked)
{
}
} else {
- cur_el = y * list.length / allocation.height;
+ cur_el = y * label_cache.length / allocation.height;
if (old_cur_el != cur_el)
- focus_layout();
+ focus_layout_needed = true;
}
//stderr.printf("MOTION %f %f CE %d\n", event.x, event.y, cur_el);
public override bool configure_event (Gdk.EventConfigure event)
{
backing_store = new Gdk.Pixmap(window, allocation.width, allocation.height, -1);
- focus_layout();
+ focus_layout_needed = true;
queue_draw();
return false;
}
return false;
}
+ public override void style_set(Gtk.Style? previous_style)
+ {
+ // Reset the pango cache if the pango context changes
+ for (int i = 0; i < pango_cache.length; ++i)
+ pango_cache[i] = null;
+ }
+ public override void direction_changed(Gtk.TextDirection previous_direction)
+ {
+ // Reset the pango cache if the pango context changes
+ for (int i = 0; i < pango_cache.length; ++i)
+ pango_cache[i] = null;
+ }
+
protected int el_y(int idx)
{
- // Undistorted Y
- int undy = idx * allocation.height / list.length;
// Distorted position
- int pos = fisheye(undy, focus_centre, distortion_factor, 0, allocation.height);
+ int pos = fisheye(idx);
//stderr.printf("%d %f %f\n", idx, undy, pos);
return pos;
}
- protected void focus_layout()
+ protected void build_label_cache()
{
- // Anchor point
- focus_centre = cur_el*allocation.height/list.length;
+ if (model == null)
+ {
+ label_cache = new string[0];
+ } else {
+ Gtk.TreeIter iter;
+ if (!model.get_iter_first(out iter))
+ {
+ label_cache = new string[0];
+ }
+ else
+ {
+ int count = model.iter_n_children(null);
+ label_cache = new string[count];
+
+ int i = 0;
+ do {
+ string val;
+ model.get(iter, _label_column, out val, -1);
+ label_cache[i] = val;
+ ++i;
+ } while (model.iter_next(ref iter));
+ }
+ }
- 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;
+ build_label_cache_needed = false;
+ focus_layout_needed = true;
+ }
- // Compute starting positions for all items in focus
- for (int idx = focus_first; idx < focus_end; ++idx)
+ protected void focus_layout()
+ {
+ if (label_cache.length == 0)
{
- int posprev = idx == 0 ? 0 : el_y(idx-1);
- int pos = el_y(idx);
- int posnext = idx == list.length-1 ? 1 : el_y(idx+1);
- int y0 = (pos+posprev)/2;
- int y1 = (pos+posnext)/2;
-
- focus_starts[idx - focus_first] = y0;
- focus_starts[idx - focus_first + 1] = y1;
+ focus_first = 0;
+ focus_end = 0;
+ focus_starts[0] = 0;
+ } else {
+ focus_first = cur_el > _focus_size/2 ? cur_el-_focus_size/2 : 0;
+ focus_end = focus_first + _focus_size;
+ if (focus_end >= label_cache.length) focus_end = label_cache.length;
+
+ // Compute starting positions for all items in focus
+ for (int idx = focus_first; idx <= focus_end; ++idx)
+ {
+ focus_starts[idx - focus_first] = el_y(idx);
+ }
}
+ focus_layout_needed = false;
}
protected void draw(Gdk.Drawable drawable)
{
+ if (build_label_cache_needed)
+ build_label_cache();
+ if (focus_layout_needed)
+ focus_layout();
+
Gtk.Style style = get_style();
// Background
pc.set_font_description(fd);
pango_cache[size] = new Pango.Layout(pc);
}
- pango_cache[size].set_text(list[idx], -1);
+ pango_cache[size].set_text(label_cache[idx], -1);
var layout = pango_cache[size];
//stderr.printf("AZAZA %p\n", layout.get_attributes());
//var attrlist = layout.get_attributes().copy();
}
}
- /*
- * The following function is adapted from Prefuse's FisheyeDistortion.java.
- *
- * A relevant annotation from Prefuse:
- *
- * For more details on this form of transformation, see Manojit Sarkar and
- * Marc H. Brown, "Graphical Fisheye Views of Graphs", in Proceedings of
- * CHI'92, Human Factors in Computing Systems, p. 83-91, 1992. Available
- * online at <a href="http://citeseer.ist.psu.edu/sarkar92graphical.html">
- * http://citeseer.ist.psu.edu/sarkar92graphical.html</a>.
- */
-
- /*
- * Distorts an item's coordinate.
- * @param x the undistorted coordinate
- * @param coordinate of the anchor or focus point
- * @param d disortion factor
- * @param min the beginning of the display
- * @param max the end of the display
- * @return the distorted coordinate
- */
- private int fisheye(int x, int a, double d, int min, int max)
- {
- if ( d != 0 ) {
- bool left = x<a;
- double v;
- int m = (left ? a-min : max-a);
- if ( m == 0 ) m = max-min;
- v = (double)(x - a).abs() / m;
- v = (d+1)/(d+(1/v));
- return (int)Math.round((left?-1:1)*m*v + a);
- } else {
- return x;
- }
- }
+ /*
+ * The following function is adapted from Prefuse's FisheyeDistortion.java.
+ *
+ * A relevant annotation from Prefuse:
+ *
+ * For more details on this form of transformation, see Manojit Sarkar and
+ * Marc H. Brown, "Graphical Fisheye Views of Graphs", in Proceedings of
+ * CHI'92, Human Factors in Computing Systems, p. 83-91, 1992. Available
+ * online at <a href="http://citeseer.ist.psu.edu/sarkar92graphical.html">
+ * http://citeseer.ist.psu.edu/sarkar92graphical.html</a>.
+ */
+
+ /*
+ * Distorts an item's coordinate.
+ * @param x the undistorted coordinate
+ * @param coordinate of the anchor or focus point
+ * @param d disortion factor
+ * @param min the beginning of the display
+ * @param max the end of the display
+ * @return the distorted coordinate
+ */
+ private int fisheye(int idx)
+ {
+ // Autocompute distortion factor
+ // 20 is the pixel size of the item at centre of focus
+ double d = label_cache.length * 20 / allocation.height;
+ if ( d <= 1 )
+ return idx * allocation.height / label_cache.length;
+
+ double a = (double)cur_el * allocation.height / label_cache.length;
+ double x = (double)idx * allocation.height / label_cache.length;
+ double max = (double)allocation.height;
+
+ if (idx < cur_el)
+ {
+ double m = a;
+ if ( m == 0 ) m = max;
+ double v = (double)(a - x) / m;
+ v = (double)(d+1)/(d+(1/v));
+ return (int)Math.round(a - m*v);
+ } else {
+ double m = max-a;
+ if ( m == 0 ) m = max;
+ double v = (double)(x - a) / m;
+ v = (double)(d+1)/(d+(1/v));
+ return (int)Math.round(a + m*v);
+ }
+ }
}
public class Fisheye : Gtk.Window
var list = new FisheyeList();
add(list);
+
+ var store = new Gtk.ListStore(1, typeof(string));
+ Gtk.TreeIter iter;
+ var infd = FileStream.open("/tmp/names", "r");
+ if (infd == null)
+ {
+ for (int i = 0; i < 300; ++i)
+ {
+ store.append(out iter);
+ store.set(iter, 0, "Antani %d".printf(i), -1);
+ }
+ } else {
+ char buf[255];
+ while (true)
+ {
+ string line = infd.gets(buf);
+ if (line == null)
+ break;
+ store.append(out iter);
+ store.set(iter, 0, line, -1);
+ }
+ }
+
+ list.set_model(store);
}
}
ToastFreeware / gregoa / zavai.git / blobdiff