- protected Gtk.TreeModel model;
- protected Gdk.Pixmap background;
- protected Gdk.Pixmap backing_store;
-
- // Renderers used at different sizes
- protected const int steps = 5;
- protected Gtk.CellRendererText[] renderers;
- protected int[] renderer_sizes;
- protected int max_renderer_size;
-
- // Labels to show, extracted from the model
- protected string[] label_cache;
- protected bool base_layout_needed;
-
- protected int cur_el;
-
- // Layout information
- protected int focus_first;
- protected int focus_end;
- protected FocusInfo[] focus_info;
- protected bool focus_locked;
- protected bool focus_layout_needed;
- protected bool is_fisheye;
- protected int focus_step_size;
- protected int focus_area_start;
-
- // Number of elements in full focus
- protected int _focus_size;
- public int focus_size {
- get { return _focus_size; }
- set {
- _focus_size = value;
- focus_info = new FocusInfo[_focus_size+2*steps+1];
- focus_layout_needed = true;
- queue_draw();
- }
- }
-
- protected int _label_column;
- public int label_column {
- get { return _label_column; }
- set {
- _label_column = value;
- base_layout_needed = true;
- queue_draw();
- }
- }
-
- //public virtual signal void cursor_changed ();
- public signal void row_activated(Gtk.TreePath path);
-
- public FisheyeListView()
- {
- model = null;
- backing_store = null;
-
- label_cache = null;
-
- renderers = new Gtk.CellRendererText[steps];
- renderer_sizes = new int[steps];
-
- // Defaults for properties
- focus_size = 10;
- label_column = 0;
-
- cur_el = 0;
- focus_locked = false;
-
- 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;
- base_layout_needed = true;
- queue_draw();
- }
-
- private void on_row_changed(Gtk.TreePath path, Gtk.TreeIter iter) { base_layout_needed = true; }
- private void on_row_deleted(Gtk.TreePath path) { base_layout_needed = true; }
- private void on_row_has_child_toggled(Gtk.TreePath path, Gtk.TreeIter iter) { base_layout_needed = true; }
- private void on_row_inserted(Gtk.TreePath path, Gtk.TreeIter iter) { base_layout_needed = true; }
- private void on_rows_reordered(Gtk.TreePath path, Gtk.TreeIter iter, void* new_order) { base_layout_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, 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, 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;
- }
-
- /* Mouse pointer moved over widget */
- public override bool motion_notify_event(Gdk.EventMotion event)
- {
- int old_cur_el = cur_el;
- int x = (int)event.x;
- int y = (int)event.y;
-
- if (is_fisheye)
- {
- focus_locked = !focus_layout_needed && x < allocation.width/2 && y >= focus_area_start+focus_info[0].y && y < focus_area_start+focus_info[focus_end - focus_first].y;
-
- if (y < focus_area_start+focus_info[0].y || y >= focus_area_start+focus_info[focus_end - focus_first].y)
- cur_el = y * (label_cache.length+1) / allocation.height;
- else
- for (int idx = 0; idx < focus_info.length; ++idx)
- if (y - focus_area_start < focus_info[idx].y + renderer_sizes[focus_info[idx].renderer])
- {
- cur_el = idx + focus_first;
- break;
- }
-
- if (!focus_locked && old_cur_el != cur_el)
- focus_layout_needed = true;
- } else {
- cur_el = y / max_renderer_size;
- if (cur_el >= label_cache.length)
- cur_el = label_cache.length - 1;
- }
-
- //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;
- }
-
- public override bool configure_event (Gdk.EventConfigure event)
- {
- base_layout_needed = true;
- queue_draw();
- return false;
- }
-
- /* Widget is asked to draw itself */
- public override bool expose_event (Gdk.EventExpose event)
- {
- draw();
-
- window.draw_drawable(
- get_style().fg_gc[Gtk.StateType.NORMAL],
- backing_store,
- event.area.x, event.area.y,
- event.area.x, event.area.y,
- event.area.width, event.area.height);
-
- return false;
- }
-
- public override void style_set(Gtk.Style? previous_style)
- {
- base_layout_needed = true;
- }
- public override void direction_changed(Gtk.TextDirection previous_direction)
- {
- base_layout_needed = true;
- }
-
- protected Gtk.CellRendererText make_cell_renderer()
- {
- var res = new Gtk.CellRendererText();
- res.font_desc = get_style().font_desc;
- res.ypad = 0;
- return res;
- }
-
- protected void base_layout()
- {
- // Rebuild label cache
- 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));
- }
- }
-
- background = new Gdk.Pixmap(window, allocation.width, allocation.height, -1);
- backing_store = new Gdk.Pixmap(window, allocation.width, allocation.height, -1);
-
- // Recreate the renderers
- renderers[renderers.length-1] = make_cell_renderer();
- renderers[renderers.length-1].set_fixed_height_from_font(1);
- renderers[renderers.length-1].get_size(this, null, null, null, null, out max_renderer_size);
- renderer_sizes[renderers.length-1] = max_renderer_size;
-
- is_fisheye = label_cache.length * max_renderer_size > allocation.height;
-
- if (is_fisheye)
- {
- renderers[0] = make_cell_renderer();
- renderers[0].size = Pango.SCALE;
- renderers[0].set_fixed_height_from_font(1);
- int min_renderer_size;
- renderers[0].get_size(this, null, null, null, null, out min_renderer_size);
- renderer_sizes[0] = min_renderer_size;
-
- focus_step_size = 0; // Size of the diminishing area
- for (int i = 1; i < renderers.length-1; ++i)
- {
- renderers[i] = make_cell_renderer();
- renderers[i].scale = (double)i / renderers.length;
- renderers[i].set_fixed_height_from_font(1);
- int size;
- renderers[i].get_size(this, null, null, null, null, out size);
- renderer_sizes[i] = size;
- focus_step_size += size;
- }
- }
-
- // Draw background
- draw_background(background);
-
- base_layout_needed = false;
- focus_layout_needed = true;
- }
-
- protected int el_renderer(int idx)
- {
- int fs2 = _focus_size/2;
- int renderer_idx;
- if (idx < cur_el)
- renderer_idx = idx - (cur_el-fs2-steps);
- else
- renderer_idx = (cur_el+fs2+steps) - idx;
- if (renderer_idx < 0)
- return 0;
- if (renderer_idx >= renderer_sizes.length)
- return renderer_sizes.length-1;
- return renderer_idx;
- }
-
- protected void focus_layout()
- {
- if (!is_fisheye || label_cache.length == 0)
- {
- focus_first = 0;
- focus_end = 0;
- focus_layout_needed = false;
- return;
- }
-
- focus_first = cur_el - _focus_size/2 - steps;
- if (focus_first < 0) focus_first = 0;
- if (focus_first + focus_info.length > label_cache.length)
- focus_first = label_cache.length - focus_info.length;
-
- int cur_pos = 0;
- int cur_idx = 0;
- int focus_area_pre = 0;
- while (cur_pos < allocation.height && cur_idx < focus_info.length)
- {
- if (focus_first + cur_idx == cur_el)
- focus_area_pre = cur_pos;
- focus_info[cur_idx].y = cur_pos;
- focus_info[cur_idx].renderer = el_renderer(focus_first + cur_idx);
-// stderr.printf("LAYOUT %d+[0-%d-%d] item %d/%d: pos %d rend %d rsz %d\n",
-// focus_first, cur_idx, focus_info.length, focus_first + cur_idx, label_cache.length,
-// cur_pos, focus_info[cur_idx].renderer, renderer_sizes[focus_info[cur_idx].renderer]);
- cur_pos += renderer_sizes[focus_info[cur_idx].renderer];
- ++cur_idx;
- }
-
- focus_info[cur_idx].y = cur_pos;
- focus_info[cur_idx].renderer = 0;
- focus_end = focus_first + cur_idx;
-
- int anchor_y = cur_el * allocation.height / (label_cache.length+1);
- int focus_area_size = cur_pos;
-
- focus_area_start = anchor_y - focus_area_pre;
- if (focus_area_start < 0) focus_area_start = 0;
- if (focus_area_start + focus_area_size > allocation.height)
- focus_area_start = allocation.height - focus_area_size;
-
-// stderr.printf("FA [0 [%d+%d=%d] %d]\n", focus_area_start, focus_area_size, focus_area_start+focus_area_size, allocation.height);
-
- focus_layout_needed = false;
- }
-
- protected void draw_background(Gdk.Drawable drawable)
- {
- Gtk.Style style = get_style();
-
- // Background
- drawable.draw_rectangle(style.bg_gc[Gtk.StateType.NORMAL], true, 0, 0, allocation.width, allocation.height);
-
- if (!is_fisheye)
- return;
-
- // Focus movement area
- drawable.draw_rectangle(style.bg_gc[Gtk.StateType.INSENSITIVE], true,
- allocation.width/2, 0, allocation.width, allocation.height);
-
- for (int y = 0; y < allocation.height/2 - 30; y += 30)
- {
- Gtk.paint_arrow(style, (Gdk.Window*)drawable, Gtk.StateType.INSENSITIVE, Gtk.ShadowType.NONE,
- null, this, null, Gtk.ArrowType.UP, false,
- allocation.width/2, y, allocation.width/2, 10);
- Gtk.paint_arrow(style, (Gdk.Window*)drawable, Gtk.StateType.INSENSITIVE, Gtk.ShadowType.NONE,
- null, this, null, Gtk.ArrowType.DOWN, false,
- allocation.width/2, allocation.height-y-30, allocation.width/2, 10);
- }
-
- Gdk.Rectangle expose_area = Gdk.Rectangle();
- expose_area.x = expose_area.y = 0;
- expose_area.width = allocation.width;
- expose_area.height = allocation.height;
-
- Gdk.Rectangle cell_area = Gdk.Rectangle();
- cell_area.x = 0;
- cell_area.width = allocation.width;
- cell_area.height = renderer_sizes[0];
- if (label_cache.length * cell_area.height >= allocation.height)
- {
- for (int y = 0; y < allocation.height; y += cell_area.height)
- {
- int idx = y * label_cache.length / allocation.height;
- cell_area.y = y;
- renderers[0].text = label_cache[idx];
- renderers[0].render((Gdk.Window*)drawable, this,
- cell_area,
- cell_area,
- expose_area,
- 0);
- }
- } else {
- int count = int.min(allocation.height/(2*cell_area.height), label_cache.length);
- for (int idx = 0; idx < count; ++idx)
- {
- cell_area.y = idx * cell_area.height;
- renderers[0].text = label_cache[idx];
- renderers[0].render((Gdk.Window*)drawable, this,
- cell_area,
- cell_area,
- expose_area,
- 0);
-
- cell_area.y = allocation.height-cell_area.y;
- renderers[0].text = label_cache[label_cache.length-idx];
- renderers[0].render((Gdk.Window*)drawable, this,
- cell_area,
- cell_area,
- expose_area,
- 0);
- }
- }
- }
-
- protected void draw()
- {
- if (base_layout_needed)
- base_layout();
- if (focus_layout_needed)
- focus_layout();
-
- var drawable = backing_store;
- Gtk.Style style = get_style();
- Gdk.Rectangle expose_area = Gdk.Rectangle();
- expose_area.x = expose_area.y = 0;
- expose_area.width = allocation.width;
- expose_area.height = allocation.height;
-
- // Background
- drawable.draw_drawable(
- get_style().fg_gc[Gtk.StateType.NORMAL],
- background,
- 0, 0, 0, 0,
- allocation.width, allocation.height);
-
- if (is_fisheye)
- {
- // Focus lock area
- drawable.draw_rectangle(style.bg_gc[Gtk.StateType.ACTIVE], true,
- 0, focus_area_start + focus_info[0].y, allocation.width/2, focus_info[focus_end - focus_first].y);
-
- // Paint items around focus
- Gdk.Rectangle cell_area = Gdk.Rectangle();
- cell_area.x = 0;
- cell_area.width = allocation.width;
- for (int idx = 0; idx < focus_info.length; ++idx)
- {
- var renderer = renderers[focus_info[idx].renderer];
- cell_area.y = focus_area_start + focus_info[idx].y;
- cell_area.height = renderer_sizes[focus_info[idx].renderer];
-
- Gtk.CellRendererState rflags = 0;
- if (idx + focus_first == cur_el)
- {
- rflags |= Gtk.CellRendererState.SELECTED | Gtk.CellRendererState.FOCUSED;
- drawable.draw_rectangle(style.bg_gc[Gtk.StateType.SELECTED], true,
- cell_area.x, cell_area.y, cell_area.width, cell_area.height);
- }
-
- renderer.text = label_cache[idx + focus_first];
- renderer.render((Gdk.Window*)drawable, this,
- cell_area,
- cell_area,
- expose_area,
- rflags);
-
- //Gdk.draw_line(drawable, style.fg_gc[itemState], 0, y0, allocation.width, y0);
- }
- } else {
- // Paint all items sequentially
- var renderer = renderers[renderers.length-1];
- Gdk.Rectangle cell_area = Gdk.Rectangle();
- cell_area.x = 0;
- cell_area.width = allocation.width;
- cell_area.height = max_renderer_size;
- for (int idx = 0; idx < label_cache.length; ++idx)
- {
- cell_area.y = idx * cell_area.height;
-
- Gtk.CellRendererState rflags = 0;
- if (idx == cur_el)
- {
- rflags |= Gtk.CellRendererState.SELECTED | Gtk.CellRendererState.FOCUSED;
- drawable.draw_rectangle(style.bg_gc[Gtk.StateType.SELECTED], true,
- cell_area.x, cell_area.y, cell_area.width, cell_area.height);
- }
-
- renderer.text = label_cache[idx];
- renderer.render((Gdk.Window*)drawable, this,
- cell_area,
- cell_area,
- expose_area,
- rflags);
- }
- }
- }
-
- /*
- * 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>.
- *
- * See also http://www.cs.umd.edu/hcil/fisheyemenu/
- */
ToastFreeware / gregoa / zavai.git / blobdiff