scrolling

1 files changed, 27 insertions, 5 deletions

diff --git a/src/ui_elements/UI.c b/src/ui_elements/UI.c
index 7e00aa3..139f746 100644
--- a/src/ui_elements/UI.c
+++ b/src/ui_elements/UI.c
@@ -3,6 +3,7 @@
 
 const int MAX_LINES = 256;
 const int SPACING_H = 1;
+const float SCROLL_SENC = 10;
 
 void DrawRecBordered(Rectangle rec, Color bg, Color border_color, int border_width) {
     DrawRectangleRounded(rec, 0.015f, 8, bg); 
@@ -19,10 +20,11 @@ int CalculateSpans(Rectangle rec, char *text, Font *font, int height, int *spans
     int ptr = 0, span_ptr = 1, last_space_ptr;
     float acc = 0;
     while (text[ptr] != 0x0) {
-        float char_width = MeasureChar(font, height, text[ptr]);
+        char symbol = text[ptr];
+        float char_width = MeasureChar(font, height, symbol);
         acc += char_width + SPACING_H;
-        if (text[ptr] == ' ') last_space_ptr = ptr;
-        if (acc > rec.width) {
+        if (symbol == ' ' || symbol == '\n') last_space_ptr = ptr;
+        if (acc > rec.width || symbol == '\n') {
             spans[span_ptr] = last_space_ptr + 1;
             ptr = last_space_ptr;
             span_ptr++;
@@ -33,8 +35,17 @@ int CalculateSpans(Rectangle rec, char *text, Font *font, int height, int *spans
     return span_ptr + 1;
 }
 
-void DrawTextInRec(Rectangle rec, char *text, Font *font, int height, Color color) {
+bool IsMouseInRec(Rectangle rec) {
+    Vector2 MousePos = GetMousePosition();
+    return CheckCollisionPointRec(MousePos, rec);
+}
+
+void DrawTextInRec(Rectangle rec, char *text, Font *font, int height, Color color, float padding, int *scroll) {
     int spans[MAX_LINES];
+    rec.x += padding;
+    rec.y += padding;
+    rec.width -= 2 * padding;
+    rec.height -= 2 * padding;
     int lines = CalculateSpans(rec, text, font, height, spans);
 
     if (lines == 2) {
@@ -43,7 +54,17 @@ void DrawTextInRec(Rectangle rec, char *text, Font *font, int height, Color colo
         return;
     }
 
-    int vertical_acc = rec.y;
+    int vertical_acc = rec.y - *scroll;
+    int text_height = lines * height;
+    int max_scroll = text_height - rec.height;
+
+    if (text_height >= rec.height && IsMouseInRec(rec)) {
+        *scroll -= GetMouseWheelMove() * SCROLL_SENC;
+        if (*scroll < 0) *scroll = 0;
+        if (*scroll > max_scroll) *scroll = max_scroll;
+    }
+
+    BeginScissorMode(rec.x, rec.y, rec.width, rec.height);
     for (int i = 1; i < lines; i++) {
         Vector2 pos = { .x = rec.x, .y = vertical_acc };
         char *line_start = text + spans[i-1];
@@ -53,4 +74,5 @@ void DrawTextInRec(Rectangle rec, char *text, Font *font, int height, Color colo
                 pos, height, SPACING_H, color);
         vertical_acc += height;
     }
+    EndScissorMode();
 }