added scroll list

include/tim.h

@@ -157,6 +157,7 @@ typedef struct TimEvent {
     char s[32];         // string representation of key, used by TimEvent_Key
 } TimEvent;
 
+
 typedef struct TimEditState {
     bool masked;    // if true prints '*' instead of buffer content
     i32 cursor;     // cursor position (utf8)
@@ -165,6 +166,22 @@ typedef struct TimEditState {
     char* s;        // zero terminated buffer
 } TimEditState;
 
+
+typedef struct TimScrollItem {
+    void* data;
+    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;
+
+typedef struct TimScrollState {
+    TimScrollItem* items;
+    u32 len;
+    u32 cur;
+    bool use_mouse_wheel;
+} TimScrollState;
+
+
 typedef struct TimState {
     i32         w;                      // screen width
     i32         h;                      // screen height
@@ -247,8 +264,6 @@ i32 tim_exit_scope(void);
 
 #pragma region widgets
 
-// TODO: create enum TimColor and struct TimStyle
-
 // frame
 // color: background, frame
 void tim_frame(i32 x, i32 y, i32 w, i32 h, TimStyle style);
@@ -281,7 +296,7 @@ bool tim_radiobutton(cstr txt, i32* state, i32 v, i32 x, i32 y, i32 w, TimStyle
 
 /// text edit - value in state
 /// @param e persistent edit state, use TimEditState_construct() to create new state
-/// @param color frame, background, text
+/// @param style frame, background, text
 /// @return key id or 0
 TimKey tim_edit(TimEditState* e, i32 x, i32 y, i32 w, TimStyle style);
 
@@ -291,15 +306,20 @@ TimKey tim_edit(TimEditState* e, i32 x, i32 y, i32 w, TimStyle style);
 void TimEditState_construct(TimEditState* e, i32 capacity, cstr initial_content);
 
 static inline void TimEditState_destroy(TimEditState* e) {
-    if(!e)
+    if(!e) return;
-        return;
     free(e->s);
 }
 
 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);
+
 #pragma endregion
 
 

src/scroll.c

@@ -0,0 +1,45 @@
+#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];
+}