453 lines
13 KiB
C++
453 lines
13 KiB
C++
/*
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* Mr. 4th Dimention - Allen Webster
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*
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* 19.08.2015
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*
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* Panel layout functions
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*
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*/
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// TOP
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internal Panel_Split
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make_panel_split(Panel_Split_Kind kind, i32 v){
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Panel_Split split = {};
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split.kind = kind;
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split.v_i32 = v;
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return(split);
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}
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internal Panel_Split
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make_panel_split(Panel_Split_Kind kind, f32 v){
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Panel_Split split = {};
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split.kind = kind;
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split.v_f32 = v;
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return(split);
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}
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internal Panel_Split
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make_panel_split_50_50(void){
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return(make_panel_split(PanelSplitKind_Ratio_TL, 0.5f));
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}
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internal Panel*
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layout__alloc_panel(Layout *layout){
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Panel *panel = 0;
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Node *node = layout->free_panels.next;
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if (node != &layout->free_panels){
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dll_remove(node);
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panel = CastFromMember(Panel, node, node);
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}
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return(panel);
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}
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internal void
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layout__free_panel(Layout *layout, Panel *panel){
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Assert(panel != layout->active_panel);
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Assert(panel != layout->root);
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dll_remove(&panel->node);
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dll_insert(&layout->free_panels, &panel->node);
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}
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internal void
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layout__set_panel_rectangle(Layout *layout, Panel *panel, i32_Rect rect){
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panel->rect_full = rect;
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panel->rect_inner = get_inner_rect(rect, layout->margin);
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}
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internal i32
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layout__evaluate_split(Panel_Split split, i32 v0, i32 v1){
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i32 v = 0;
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switch (split.kind){
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case PanelSplitKind_Ratio_TL:
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{
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v = round32(lerp((f32)v0, split.v_f32, (f32)v1));
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}break;
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case PanelSplitKind_Ratio_BR:
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{
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v = round32(lerp((f32)v1, split.v_f32, (f32)v0));
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}break;
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case PanelSplitKind_FixedPixels_TL:
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{
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v = clamp_top(v0 + split.v_i32, v1);
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}break;
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case PanelSplitKind_FixedPixels_BR:
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{
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v = clamp_bottom(v0, v1 - split.v_i32);
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}break;
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}
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return(v);
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}
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internal void
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layout_propogate_sizes_down_from_node(Layout *layout, Panel *panel){
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if (panel->kind == PanelKind_Intermediate){
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Panel *tl_panel = panel->tl_panel;
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Panel *br_panel = panel->br_panel;
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i32_Rect r1 = panel->rect_full;
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i32_Rect r2 = panel->rect_full;
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if (panel->vertical_split){
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i32 x_pos = layout__evaluate_split(panel->split, r1.x0, r1.x1);
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r1.x1 = x_pos;
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r2.x0 = x_pos;
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}
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else{
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i32 y_pos = layout__evaluate_split(panel->split, r1.y0, r1.y1);
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r1.y1 = y_pos;
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r2.y0 = y_pos;
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}
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layout__set_panel_rectangle(layout, tl_panel, r1);
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layout__set_panel_rectangle(layout, br_panel, r2);
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layout_propogate_sizes_down_from_node(layout, tl_panel);
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layout_propogate_sizes_down_from_node(layout, br_panel);
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}
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}
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internal i32
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layout_get_open_panel_count(Layout *layout){
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return(layout->open_panel_count);
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}
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internal Panel*
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layout_get_first_open_panel(Layout *layout){
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Panel *panel = CastFromMember(Panel, node, layout->open_panels.next);
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if (panel != 0 && &panel->node == &layout->open_panels){
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panel = 0;
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}
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AssertImplies(panel != 0, panel->kind == PanelKind_Final);
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return(panel);
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}
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internal Panel*
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layout_get_next_open_panel(Layout *layout, Panel *panel){
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panel = CastFromMember(Panel, node, panel->node.next);
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if (&panel->node == &layout->open_panels){
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panel = 0;
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}
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AssertImplies(panel != 0, panel->kind == PanelKind_Final);
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return(panel);
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}
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internal Panel*
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layout_get_active_panel(Layout *layout){
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return(layout->active_panel);
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}
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internal Panel*
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layout_split_panel(Layout *layout, Panel *panel, b32 vertical_split, b32 br_split){
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Panel *new_panel = 0;
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if (layout->open_panel_count < layout->open_panel_max_count){
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Panel *intermediate = layout__alloc_panel(layout);
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new_panel = layout__alloc_panel(layout);
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dll_insert(&layout->open_panels, &new_panel->node);
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dll_insert(&layout->intermediate_panels, &intermediate->node);
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Panel *parent = panel->parent;
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// link new intermediate and parent
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intermediate->parent = parent;
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if (parent != 0){
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Assert(parent->kind == PanelKind_Intermediate);
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if (parent->tl_panel == panel){
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parent->tl_panel = intermediate;
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}
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else{
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Assert(parent->br_panel == panel);
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parent->br_panel = intermediate;
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}
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}
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else{
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Assert(layout->root == panel);
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layout->root = intermediate;
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}
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// link new intermediate and child panels
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panel->parent = intermediate;
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new_panel->parent = intermediate;
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if (br_split){
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intermediate->br_panel = new_panel;
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intermediate->tl_panel = panel;
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}
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else{
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intermediate->tl_panel = new_panel;
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intermediate->br_panel = panel;
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}
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// init the intermediate
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intermediate->kind = PanelKind_Intermediate;
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intermediate->vertical_split = vertical_split;
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intermediate->split = make_panel_split_50_50();
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intermediate->screen_region = panel->screen_region;
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// init the new panel
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new_panel->kind = PanelKind_Final;
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new_panel->view = 0;
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// propogate rectangle sizes down from the new intermediate to
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// resize the panel and the new panel.
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layout_propogate_sizes_down_from_node(layout, intermediate);
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// update layout state
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layout->open_panel_count += 1;
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layout->active_panel = new_panel;
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layout->panel_state_dirty = true;
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}
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return(new_panel);
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}
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internal b32
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layout_close_panel(Layout *layout, Panel *panel){
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b32 result = false;
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if (layout->open_panel_count > 1){
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Panel *parent = panel->parent;
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Assert(parent != 0);
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// find sibling
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Panel *sibling = 0;
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if (parent->tl_panel == panel){
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sibling = parent->br_panel;
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}
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else{
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Assert(parent->br_panel == panel);
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sibling = parent->tl_panel;
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}
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// update layout state
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if (layout->active_panel == panel){
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Panel *new_active = sibling;
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for (;new_active->kind == PanelKind_Intermediate;){
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new_active = new_active->br_panel;
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}
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layout->active_panel = new_active;
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}
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layout->panel_state_dirty = true;
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layout->open_panel_count -= 1;
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// link grand parent and sibling
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Panel *g_parent = parent->parent;
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sibling->parent = g_parent;
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if (g_parent != 0){
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if (g_parent->tl_panel == parent){
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g_parent->tl_panel = sibling;
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}
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else{
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Assert(g_parent->br_panel == parent);
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g_parent->br_panel = sibling;
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}
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}
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else{
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Assert(parent == layout->root);
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layout->root = sibling;
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}
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// set sibling's size
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sibling->screen_region = parent->screen_region;
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// set the sizes down stream of sibling
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layout_propogate_sizes_down_from_node(layout, sibling);
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// free panel and parent
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layout__free_panel(layout, panel);
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layout__free_panel(layout, parent);
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result = true;
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}
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return(result);
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}
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internal Panel*
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layout_initialize(Partition *part, Layout *layout){
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i32 panel_alloc_count = MAX_VIEWS*2 - 1;
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Panel *panels = push_array(part, Panel, panel_alloc_count);
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layout->margin = 3;
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layout->open_panel_count = 0;
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layout->open_panel_max_count = MAX_VIEWS;
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dll_init_sentinel(&layout->open_panels);
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dll_init_sentinel(&layout->intermediate_panels);
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Panel *panel = panels;
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layout->free_panels.next = &panel->node;
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panel->node.prev = &layout->free_panels;
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for (i32 i = 1; i < MAX_VIEWS; i += 1, panel += 1){
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panel[1].node.prev = &panel[0].node;
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panel[0].node.next = &panel[1].node;
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}
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panel->node.next = &layout->free_panels;
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layout->free_panels.prev = &panel->node;
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panel = layout__alloc_panel(layout);
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panel->parent = 0;
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panel->kind = PanelKind_Final;
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panel->view = 0;
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block_zero_struct(&panel->screen_region);
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dll_insert(&layout->open_panels, &panel->node);
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layout->open_panel_count += 1;
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layout->root = panel;
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layout->active_panel = panel;
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layout->panel_state_dirty = true;
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return(panel);
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}
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internal void
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layout_set_margin(Layout *layout, i32 margin){
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if (layout->margin != margin){
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layout->margin = margin;
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layout__set_panel_rectangle(layout, layout->root, i32R(0, 0, layout->full_dim.x, layout->full_dim.y));
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layout_propogate_sizes_down_from_node(layout, layout->root);
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layout->panel_state_dirty = true;
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}
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}
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internal void
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layout_set_root_size(Layout *layout, Vec2_i32 dim){
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if (layout->full_dim != dim){
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layout->full_dim = dim;
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layout__set_panel_rectangle(layout, layout->root, i32R(0, 0, dim.x, dim.y));
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layout_propogate_sizes_down_from_node(layout, layout->root);
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layout->panel_state_dirty = true;
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}
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}
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internal Vec2_i32
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layout_get_root_size(Layout *layout){
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return(layout->full_dim);
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}
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internal i32
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layout_get_absolute_position_of_split(Panel *panel){
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i32 pos = 0;
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if (panel->vertical_split){
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pos = layout__evaluate_split(panel->split, panel->rect_full.x0, panel->rect_full.x1);
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}
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else{
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pos = layout__evaluate_split(panel->split, panel->rect_full.y0, panel->rect_full.y1);
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}
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return(pos);
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}
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internal Range
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layout__get_limiting_range_on_split_children(i32 mid, b32 vertical_split, Panel *panel, Range range){
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if (panel->kind == PanelKind_Intermediate){
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if (vertical_split == panel->vertical_split){
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i32 pos = layout_get_absolute_position_of_split(panel);
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if (mid < pos && pos < range.max){
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range.max = pos;
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}
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else if (range.min < pos && pos < mid){
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range.min = pos;
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}
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}
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range = layout__get_limiting_range_on_split_children(mid, vertical_split, panel->tl_panel, range);
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range = layout__get_limiting_range_on_split_children(mid, vertical_split, panel->br_panel, range);
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}
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return(range);
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}
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internal Range
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layout_get_limiting_range_on_split(Layout *layout, Panel *panel){
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// root level min max
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Range range = {};
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if (panel->vertical_split){
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range.max = layout->full_dim.x;
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}
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else{
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range.max = layout->full_dim.y;
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}
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// get mid
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i32 mid = layout_get_absolute_position_of_split(panel);
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// parents min max
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for (Panel *panel_it = panel;
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panel_it != 0;
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panel_it = panel_it->parent){
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if (panel->vertical_split == panel_it->vertical_split){
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i32 pos = layout_get_absolute_position_of_split(panel_it);
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if (mid < pos && pos < range.max){
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range.max = pos;
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}
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else if (range.min < pos && pos < mid){
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range.min = pos;
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}
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}
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}
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// children min max
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if (panel->kind == PanelKind_Intermediate){
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range = layout__get_limiting_range_on_split_children(mid, panel->vertical_split, panel->tl_panel, range);
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range = layout__get_limiting_range_on_split_children(mid, panel->vertical_split, panel->br_panel, range);
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}
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return(range);
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}
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internal void
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layout__reverse_evaluate_panel_split(Panel *panel, i32 position){
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i32 v0 = 0;
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i32 v1 = 0;
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if (panel->vertical_split){
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v0 = panel->rect_full.x0;
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v1 = panel->rect_full.x1;
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}
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else{
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v0 = panel->rect_full.y0;
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v1 = panel->rect_full.y1;
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}
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switch (panel->split.kind){
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case PanelSplitKind_Ratio_TL:
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{
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panel->split.v_f32 = unlerp((f32)v0, (f32)position, (f32)v1);
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}break;
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case PanelSplitKind_Ratio_BR:
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{
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panel->split.v_f32 = unlerp((f32)v1, (f32)position, (f32)v0);
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}break;
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case PanelSplitKind_FixedPixels_TL:
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{
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panel->split.v_i32 = clamp(v0, position, v1) - v0;
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}break;
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case PanelSplitKind_FixedPixels_BR:
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{
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panel->split.v_i32 = v1 - clamp(v0, position, v1);
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}break;
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}
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}
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internal void
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layout__set_split_absolute_position_inner(Panel *panel){
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if (panel->kind == PanelKind_Intermediate){
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i32_Rect r = panel->rect_full;
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i32 position = 0;
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if (panel->vertical_split){
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position = layout__evaluate_split(panel->split, r.x0, r.x1);
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}
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else{
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position = layout__evaluate_split(panel->split, r.y0, r.y1);
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}
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layout__reverse_evaluate_panel_split(panel, position);
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}
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}
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internal void
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layout_set_split_absolute_position(Layout *layout, Panel *panel, i32 absolute_position){
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if (panel->kind == PanelKind_Intermediate){
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layout__reverse_evaluate_panel_split(panel, absolute_position);
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layout__set_split_absolute_position_inner(panel->tl_panel);
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layout__set_split_absolute_position_inner(panel->br_panel);
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layout_propogate_sizes_down_from_node(layout, panel);
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layout->panel_state_dirty = true;
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}
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}
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// BOTTOM
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