Text selection

1 files changed, 100 insertions, 10 deletions

diff --git a/examples/ui.c b/examples/ui.c
index 13f0f68..16378d4 100755
--- a/examples/ui.c
+++ b/examples/ui.c
@@ -444,8 +444,6 @@ void draw_text_area(u32 color, f64 x0, f64 y0, f64 width, f64 height, f64 max_sc
 }
 
 void draw_text_cursor(u32 color, f64 x0, f64 y0, f64 width, f64 height, f64 max_scale_x, f64 max_scale_y, i64 cursor, i64 selection, i64 num_chars, c8 *text) {
-  (void) selection;
-
   assert(max_scale_x > 1e-6);
   assert(max_scale_y > 1e-6);
 
@@ -453,7 +451,6 @@ void draw_text_cursor(u32 color, f64 x0, f64 y0, f64 width, f64 height, f64 max_
   i64 num_rows    = enum_text_rows(num_chars, text);
   i64 cursor_x    = text_cursor(cursor, text);
   i64 cursor_y    = enum_text_rows(cursor, text);
-
   f64 scale_x = width  / num_columns;
   f64 scale_y = height / num_rows;
 
@@ -465,7 +462,49 @@ void draw_text_cursor(u32 color, f64 x0, f64 y0, f64 width, f64 height, f64 max_
   kx = k * max_scale_x;
   ky = k * max_scale_y;
 
-  draw_panel(OP_XOR, color, x0 + kx * cursor_x, y0 + ky * cursor_y - ky * CHAR_NUM_BITS_Y, kx * .5, ky * (CHAR_NUM_BITS_Y - 1));
+  if (selection != 0) {
+    i64 selection_x, selection_y;
+
+    if (selection > 0) {
+      selection_x = text_cursor(cursor + selection, text);
+      selection_y = enum_text_rows(cursor + selection, text);
+    } else {
+      selection_x = cursor_x;
+      selection_y = cursor_y;
+      cursor_x    = text_cursor(cursor + selection, text);
+      cursor_y    = enum_text_rows(cursor + selection, text);
+    }
+
+    if (cursor_y == selection_y)
+      draw_panel(OP_XOR, color,
+        x0 + kx * cursor_x,
+        y0 + ky * cursor_y - ky * (CHAR_NUM_BITS_Y + 1),
+        kx * (selection_x - cursor_x),
+        ky * (CHAR_NUM_BITS_Y + 1)
+      );
+    else {
+      draw_panel(OP_XOR, color,
+        x0 + kx * cursor_x,
+        y0 + ky * cursor_y - ky * (CHAR_NUM_BITS_Y + 1),
+        kx * (num_columns - cursor_x),
+        ky * (CHAR_NUM_BITS_Y + 1)
+      );
+      for (i64 j = cursor_y + CHAR_NUM_BITS_Y + 1; j < selection_y; j += CHAR_NUM_BITS_Y + 1)
+        draw_panel(OP_XOR, color,
+          x0,
+          y0 + ky * j - ky * (CHAR_NUM_BITS_Y + 1),
+          kx * num_columns,
+          ky * (CHAR_NUM_BITS_Y + 1)
+        );
+      draw_panel(OP_XOR, color,
+        x0,
+        y0 + ky * selection_y - ky * (CHAR_NUM_BITS_Y + 1),
+        kx * selection_x,
+        ky * (CHAR_NUM_BITS_Y + 1)
+      );
+    }
+  } else
+    draw_panel(OP_XOR, color, x0 + kx * cursor_x, y0 + ky * cursor_y - ky * CHAR_NUM_BITS_Y, kx * .5, ky * (CHAR_NUM_BITS_Y - 1));
 }
 
 i32 main(i32 argc, c8 **argv) {
@@ -540,17 +579,39 @@ i32 main(i32 argc, c8 **argv) {
     for (i64 i = 0; i < platform.input_size; ++i)
       switch (platform.input[i]) {
         case KEY_LEFT:
+          if (platform.key_down[MOD_SHIFT]) {
+            if (cursor > 0)
+              ++selection;
+          } else if (selection != 0) {
+            cursor = selection < 0 ? cursor + selection + 1 : cursor + 1;
+            selection = 0;
+          }
           if (cursor > 0)
             --cursor;
           break;
 
         case KEY_RIGHT:
+          if (platform.key_down[MOD_SHIFT]) {
+            if (cursor < text_len)
+              --selection;
+          } else if (selection != 0) {
+            cursor = selection < 0 ? cursor - 1 : cursor + selection - 1;
+            selection = 0;
+          }
           if (cursor < text_len)
             ++cursor;
           break;
 
         case '\b':
-          if (cursor > 0 && text_len > 0) {
+          if (selection != 0) {
+            i64 i0 = selection < 0 ? cursor + selection : cursor;
+            i64 i1 = selection < 0 ? cursor : cursor + selection;
+            for (i64 i = 0; i1 + i < text_len; ++i)
+              text[i0 + i] = text[i1 + i];
+            selection = 0;
+            cursor    = i0;
+            text_len -= i1 - i0;
+          } else if (cursor > 0 && text_len > 0) {
             for (i64 i = cursor; i < text_len; ++i)
               text[i - 1] = text[i];
             --cursor;
@@ -558,12 +619,40 @@ i32 main(i32 argc, c8 **argv) {
           }
           break;
 
+        case KEY_DELETE:
+          if (selection != 0) {
+            i64 i0 = selection < 0 ? cursor + selection : cursor;
+            i64 i1 = selection < 0 ? cursor : cursor + selection;
+            for (i64 i = 0; i1 + i < text_len; ++i)
+              text[i0 + i] = text[i1 + i];
+            selection = 0;
+            cursor    = i0;
+            text_len -= i1 - i0;
+          } else if (cursor < text_len) {
+            for (i64 i = cursor + 1; i < text_len; ++i)
+              text[i - 1] = text[i];
+            --text_len;
+          }
+          break;
+
         default:
-          if (platform.input[i] > 0 && platform.input[i] < 128 && text_len < (i64) sizeof text) {
-            for (i64 i = text_len; i > cursor; --i)
-              text[i] = text[i - 1];
-            text[cursor++] = (c8) platform.input[i];
-            ++text_len;
+          if (platform.input[i] > 0 && platform.input[i] < 128) {
+            if (selection != 0) {
+              i64 i0 = selection < 0 ? cursor + selection : cursor;
+              i64 i1 = selection < 0 ? cursor : cursor + selection;
+              for (i64 i = 0; i1 + i < text_len; ++i)
+                text[i0 + i] = text[i1 + i];
+              selection = 0;
+              cursor    = i0;
+              text_len -= i1 - i0;
+            }
+
+            if (text_len < (i64) sizeof text) {
+              for (i64 i = text_len; i > cursor; --i)
+                text[i] = text[i - 1];
+              text[cursor++] = (c8) platform.input[i];
+              ++text_len;
+            }
           }
       }
 
@@ -588,6 +677,7 @@ i32 main(i32 argc, c8 **argv) {
 //  - Clipboard
 //  - Sound
 //  - Sockets
+//  - Clipboard daemon
 //
 //  X11 clipboard
 //  https://handmade.network/forums/articles/t/8544-implementing_copy_paste_in_x11