finished scroll_view

include/tim.h

@@ -170,20 +170,30 @@ typedef struct TimEditState {
 } TimEditState;
 
 
-typedef struct TimScrollItem {
-    void* data;
+typedef struct TimPanelItem {
+    // Size of item to know where to draw next item.
+    // Set to to A and items will be spread equally across panel
+    i32 w;
+    i32 h;
+    void* data;         // is passed to draw()
     void* focus_target; // is assigned to tim->focus
-    i32 h;              // height of the item to know where to draw next item
-    void (*draw)(bool is_selected, TimRect place, void* data);
-} TimScrollItem;
+    void (*draw)(void* data, TimRect place, bool is_selected);
+} TimPanelItem;
 
-typedef struct TimScrollState {
-    TimScrollItem* items;
-    u32 len;
-    u32 cur;
-    bool use_mouse_wheel;
-} TimScrollState;
+typedef struct TimPanel {
+    TimPanelItem* items; // array
+    i32 len;            // number of items
+    i32 cur;            // index of current item
+    i32 spacing;        // distance between items
+    bool is_horizontal;
+} TimPanel;
 
+typedef struct TimScrollView {
+    i32 offset;
+    i32 content_h;
+    void* data;         // is passed to draw()
+    void (*draw)(void* data, TimRect place);
+} TimScrollView;
 
 typedef struct TimState {
     i32         w;                      // screen width
@@ -262,6 +272,24 @@ i32 tim_enter_scope(i32 x, i32 y, i32 w, i32 h);
 // exit scope and pop stack
 i32 tim_exit_scope(void);
 
+static inline TimRect tim_rect_fit(TimRect r){
+    if(r.x < 0)
+        r.x = 0;
+    else if(r.x >= tim->w)
+        r.w = 0;
+    else if(r.x + r.w > tim->w)
+        r.w = tim->w - r.x;
+    
+    if(r.y < 0)
+        r.y = 0;
+    else if(r.y >= tim->h)
+        r.y = tim->h - 1;
+    else if(r.y + r.h > tim->h)
+        r.h = tim->h - r.y;
+    
+    return r;
+}
+
 #pragma endregion
 
 
@@ -297,6 +325,7 @@ bool tim_checkbox(cstr txt, i32* state, i32 x, i32 y, i32 w, TimStyle style);
 // color: radio, background, text
 bool tim_radiobutton(cstr txt, i32* state, i32 v, i32 x, i32 y, i32 w, TimStyle style);
 
+
 /// text edit - value in state
 /// @param e persistent edit state, use TimEditState_construct() to create new state
 /// @param style frame, background, text
@@ -308,16 +337,21 @@ TimKey tim_edit(TimEditState* e, i32 x, i32 y, i32 w, TimStyle style);
 /// @param capacity buffer size in bytes
 /// @param initial_content may be NULL
 void TimEditState_construct(TimEditState* e, char* buffer, i32 capacity, cstr initial_content);
-
 void TimEditState_insert(TimEditState* e, cstr s);
 void TimEditState_delete(TimEditState* e);
 
-/// @param l list of rows to display
-/// @param style frame, background, text
-TimScrollItem* tim_scroll(TimScrollState* l, i32 x, i32 y, i32 w, i32 h, TimStyle style);
 
-void TimScrollState_selectNext(TimScrollState* l);
-void TimScrollState_selectPrev(TimScrollState* l);
+/// Panel with sequence of items. You can select an item by arrow keys or mouse click.
+/// @param self persistent state
+/// @param is_selected if panel is not selected, it calls items[:]->draw(is_selected=false)
+/// @return current item
+TimPanelItem* tim_panel(TimPanel* self, bool is_selected, i32 x, i32 y, i32 w, i32 h);
+
+void TimPanel_selectNext(TimPanel* self);
+void TimPanel_selectPrev(TimPanel* self);
+
+/// 
+void tim_scroll_view(TimScrollView* self, i32 x, i32 y, i32 w, i32 h, TimStyle style);
 
 #pragma endregion
 

src/drawing.c

@@ -15,31 +15,41 @@ void tim_clear_cells(void) {
 }
 
 void tim_draw_chr(TimCell cell, i32 x, i32 y) {
-    if (x >= 0 && x < tim->w && y >= 0 && y < tim->h) {
+    TimRect scope = tim_rect_fit(tim->scopes[tim->scope]);
+    
+    if (x >= scope.x && x < scope.x + scope.w &&
+        y >= scope.y && y < scope.y + scope.h) 
+    {
         tim->cells[x + y * tim->w] = cell;
     }
 }
 
 void tim_draw_row(TimCell cell, i32 x, i32 y, i32 w) {
-    if (y >= 0 && y < tim->h && w > 0) {
-        for (i32 i = MAX(x, 0); i < MIN(x + w, tim->w); i++) {
+    TimRect scope = tim_rect_fit(tim->scopes[tim->scope]);
+    
+    if (y >= scope.y && y < scope.y + scope.h && w > 0) {
+        for (i32 i = MAX(x, scope.x); i < MIN(x + w, scope.x + scope.w); i++) {
             tim->cells[i + y * tim->w] = cell;
         }
     }
 }
 
 void tim_draw_col(TimCell cell, i32 x, i32 y, i32 h) {
-    if (x >= 0 && x < tim->w && h > 0) {
-        for (i32 i = MAX(y, 0); i < MIN(y + h, tim->h); i++) {
+    TimRect scope = tim_rect_fit(tim->scopes[tim->scope]);
+    
+    if (x >= scope.x && x < scope.x + scope.w && h > 0) {
+        for (i32 i = MAX(y, scope.y); i < MIN(y + h, scope.y + scope.h); i++) {
             tim->cells[x + i * tim->w] = cell;
         }
     }
 }
 
 void tim_fill(TimCell cell, i32 x, i32 y, i32 w, i32 h) {
+    TimRect scope = tim_rect_fit(tim->scopes[tim->scope]);
+
     if (w > 0 && h > 0) {
-        for (i32 iy = MAX(y, 0); iy < MIN(y + h, tim->h); iy++) {
-            for (i32 ix = MAX(x, 0); ix < MIN(x + w, tim->w); ix++) {
+        for (i32 iy = MAX(y, scope.y); iy < MIN(y + h, scope.y + scope.h); iy++) {
+            for (i32 ix = MAX(x, scope.x); ix < MIN(x + w, scope.x + scope.w); ix++) {
                 tim->cells[ix + iy * tim->w] = cell;
             }
         }
@@ -47,8 +57,10 @@ void tim_fill(TimCell cell, i32 x, i32 y, i32 w, i32 h) {
 }
 
 void tim_draw_str(cstr s, i32 x, i32 y, i32 w, u8 fg, u8 bg) {
-    if (s && y >= 0 && x < tim->w && y < tim->h ) {
-        i32  end  = MIN(x + w, tim->w);
+    TimRect scope = tim_rect_fit(tim->scopes[tim->scope]);
+    
+    if (s && y >= 0 && x < scope.x + scope.w && y < scope.y + scope.h ) {
+        i32  end  = MIN(x + w, scope.x + scope.w);
         bool wide = false;
         for (i32 i = 0; s[i] && x < end; x++) {
             TimCell c = tim_cell(&s[i], fg, bg);
@@ -63,6 +75,8 @@ void tim_draw_str(cstr s, i32 x, i32 y, i32 w, u8 fg, u8 bg) {
 }
 
 void tim_draw_box(i32 x, i32 y, i32 w, i32 h, u8 fg, u8 bg) {
+    if(w <= 0 || h <= 0)
+        return;
     tim_draw_chr(tim_cell("┌", fg, bg), x        , y);
     tim_draw_chr(tim_cell("┐", fg, bg), x + w - 1, y);
     tim_draw_chr(tim_cell("└", fg, bg), x        , y + h - 1);
@@ -75,8 +89,10 @@ void tim_draw_box(i32 x, i32 y, i32 w, i32 h, u8 fg, u8 bg) {
 }
 
 void tim_draw_invert(i32 x, i32 y, i32 w) {
-    if (y >= 0 && y < tim->h && w > 0) {
-        for (i32 i = MAX(x, 0); i < MIN(x + w, tim->w); i++) {
+    TimRect scope = tim_rect_fit(tim->scopes[tim->scope]);
+    
+    if (y >= 0 && y < scope.y + scope.h && w > 0) {
+        for (i32 i = MAX(x, scope.x); i < MIN(x + w, scope.x + scope.w); i++) {
             TimCell c = tim->cells[i + y * tim->w];
             tim->cells[i + y * tim->w].fg = c.bg;
             tim->cells[i + y * tim->w].bg = c.fg;

src/panel.c

@@ -0,0 +1,86 @@
+#include "tim.h"
+
+void TimPanel_selectNext(TimPanel* l){
+    if(l->cur + 1 < l->len)
+        l->cur++;
+}
+
+void TimPanel_selectPrev(TimPanel* l){
+    if(l->cur - 1 >= 0)
+        l->cur--;
+}
+
+TimPanelItem* tim_panel(TimPanel* self, bool is_panel_selected, i32 x, i32 y, i32 w, i32 h){
+    // select item with keyboard
+    if(tim_is_key_press(self->is_horizontal ? TimKey_Left : TimKey_Up))
+    {
+        TimPanel_selectPrev(self);
+    }
+    else if(tim_is_key_press(self->is_horizontal ? TimKey_Right : TimKey_Down))
+    {
+        TimPanel_selectNext(self);
+    }
+    
+    // set focus on current item
+    if(self->cur < self->len)
+        tim->focus = self->items[self->cur].focus_target;
+
+    tim_scope(x, y, w, h)
+    {
+        TimRect content_scope = tim->scopes[tim->scope];
+        // TODO: draw current item and as much previous items as possible in scope
+        TimRect item_place = { 0 };
+        for(i32 i = 0; i < self->len; i++){
+            TimPanelItem* item = &self->items[i];
+
+            item_place.w = item->w;
+            if(item_place.w == A){
+                if(self->is_horizontal){
+                    item_place.w = content_scope.w / self->len ;
+                    // add remaining width to the last item
+                    if(i == self->len - 1)
+                        item_place.w += content_scope.w % self->len;
+                    else item_place.w -= self->spacing;
+                }
+                else {
+                    item_place.w = content_scope.w;
+                }
+            }
+
+            item_place.h = item->h;
+            if(item_place.h == A){
+                if(self->is_horizontal){
+                    item_place.h = content_scope.h;
+                }
+                else {
+                    item_place.h = content_scope.h / self->len - self->spacing;
+                    // add remaining height to the last item
+                    if(i == self->len - 1)
+                        item_place.h += content_scope.h % self->len;
+                    else item_place.h -= self->spacing;
+                }
+            }
+
+            // select item with mouse click
+            if(tim_is_mouse_click_over(tim_scope_rect_to_absolute(item_place.x, item_place.y, item_place.w, item_place.h))){
+                self->cur = i;
+                tim->focus = item->focus_target;
+            }
+
+            bool is_item_selected = false;
+            if(is_panel_selected)
+                is_item_selected = i == self->cur;
+            item->draw(item->data, item_place, is_item_selected);
+
+            // adjust place for next item
+            if(self->is_horizontal){
+                item_place.x += item_place.w + self->spacing;
+            }
+            else {
+                item_place.y += item_place.h + self->spacing;
+            }
+        }
+    }
+
+    return &self->items[self->cur];
+}

src/scope.c

@@ -35,9 +35,9 @@ TimRect tim_scope_rect_to_absolute(i32 x, i32 y, i32 w, i32 h) {
 }
 
 i32 tim_enter_scope(i32 x, i32 y, i32 w, i32 h) {
-    if (tim->scope + 1 >= TIM_MAX_SCOPE) {
-         return 0;
-    }
+    if (tim->scope + 1 >= TIM_MAX_SCOPE)
+        return 0;
+
     TimRect r = tim_scope_rect_to_absolute(x, y, w, h);
     tim->scope += 1;
     tim->scopes[tim->scope] = r;

src/scroll.c

@@ -1,45 +0,0 @@
-#include "tim.h"
-
-void TimScrollState_selectNext(TimScrollState* l){
-    l->cur = (l->cur + 1) % l->len;
-}
-
-void TimScrollState_selectPrev(TimScrollState* l){
-    l->cur = (l->len + l->cur - 1) % l->len;
-}
-
-TimScrollItem* tim_scroll(TimScrollState* l, i32 x, i32 y, i32 w, i32 h, TimStyle style){
-    // select with buttons and mouse wheel
-    if(tim_is_key_press(TimKey_Down) 
-        || (l->use_mouse_wheel && tim_is_mouse_scroll_down()))
-    {
-        TimScrollState_selectNext(l);
-    }
-    if(tim_is_key_press(TimKey_Up) 
-        || (l->use_mouse_wheel && tim_is_mouse_scroll_up()))
-    {
-        TimScrollState_selectPrev(l);
-    }
-    
-    tim->focus = l->items[l->cur].focus_target;
-
-    tim_frame(x, y, w, h, style);
-
-    TimRect absolute = tim_scope_rect_to_absolute(x, y, w, h);
-    TimRect place = { .x = x + 1, .y = y + 1, .w = absolute.w - 2, .h = absolute.h - 2 };
-    for(u32 i = 0; i < l->len; i++){
-        TimScrollItem* item = &l->items[i];
-        place.h = item->h;
-        
-        // select with mouse click
-        if(tim_is_mouse_click_over(tim_scope_rect_to_absolute(place.x, place.y, place.w, place.h))){
-            l->cur = i;
-            tim->focus = item->focus_target;
-        }
-
-        item->draw(i == l->cur, place, item->data);
-        place.y += place.h;
-    }
-
-    return &l->items[l->cur];
-}

src/scroll_view.c

@@ -0,0 +1,81 @@
+#include "tim.h"
+#include <math.h>
+
+void tim_scroll_view(TimScrollView* self, i32 x, i32 y, i32 w, i32 h, TimStyle style){
+    tim_scope(x, y, w, h)
+    {
+        TimRect content_scope = tim->scopes[tim->scope];
+        // shrink content_scope to put scrollbar
+        content_scope.w -= 1;
+        i32 max_offset = MAX(self->content_h - content_scope.h, 0);
+        
+        // draw scroll bar and 
+        TimRect arrow_up_r = {
+            .x = content_scope.x + content_scope.w, 
+            .y = content_scope.y,
+            .w = 1,
+            .h = 1
+        };
+        TimRect scrollbar_r = {
+            .x = arrow_up_r.x,
+            .y = arrow_up_r.y + 1,
+            .w = 1,
+            .h = content_scope.h - 2
+        };
+        TimRect arrow_down_r = {
+            .x = scrollbar_r.x,
+            .y = scrollbar_r.y + scrollbar_r.h,
+            .w = 1,
+            .h = 1
+        };
+
+        if (tim->event.type == TimEvent_Draw) {
+            f32 scroll_ratio = 0;
+            f32 slider_h = 0;
+            if(max_offset != 0){
+                slider_h = ceilf((f32)scrollbar_r.h / max_offset);
+                scroll_ratio = (f32)self->offset / max_offset + 0.001f;
+            }
+            i32 slider_y = scrollbar_r.y + (scrollbar_r.h - slider_h) * scroll_ratio;
+
+            tim_draw_chr(tim_cell("▲", style.brd, style.bg), arrow_up_r.x, arrow_up_r.y);
+            tim_draw_col(tim_cell("░", style.brd, style.bg), scrollbar_r.x, scrollbar_r.y, scrollbar_r.h);
+            tim_draw_col(tim_cell("█", style.brd, style.bg), scrollbar_r.x, slider_y, slider_h);
+            tim_draw_chr(tim_cell("▼", style.brd, style.bg), arrow_down_r.x, arrow_down_r.y);
+        }
+
+        if(tim_is_mouse_click_over(arrow_up_r) || tim_is_mouse_scroll_up()){
+            self->offset--;
+        }
+        else if(tim_is_mouse_click_over(arrow_down_r) || tim_is_mouse_scroll_down()){
+            self->offset++;
+        }
+        else if(tim_is_key_press(TimKey_PageUp)){
+            self->offset -= content_scope.h;
+        }
+        else if(tim_is_key_press(TimKey_PageDown)){
+            self->offset += content_scope.h;
+        }
+        
+        if(self->offset > max_offset)
+            self->offset = max_offset;
+        else if(self->offset < 0)
+            self->offset = 0;
+
+        if(tim_is_mouse_click_over(scrollbar_r)){
+            i32 click_y_rel = tim->event.y - scrollbar_r.y;
+            if(scrollbar_r.h != 0){
+                f32 slider_h = ceilf((f32)scrollbar_r.h / max_offset);
+                f32 scroll_ratio = (f32)click_y_rel / (scrollbar_r.h - slider_h) + 0.001f;
+                self->offset = max_offset * scroll_ratio;
+            }
+        }
+
+        // update current scope
+        tim->scopes[tim->scope] = content_scope; 
+
+        // draw content
+        TimRect content_place = { .x = 0, .y = -self->offset - 1, .w = content_scope.w, .h = content_scope.h };
+        self->draw(self->data, content_place);
+    }
+}