From e0505dc974d97fb8de90d58301adb160d027d905 Mon Sep 17 00:00:00 2001
From: Krzosa Karol <krzosa.karol@gmail.com>
Date: Tue, 2 Jul 2024 07:10:32 +0200
Subject: [PATCH] Implement double click

---
 src/text_editor/buffer.cpp                    |  7 ++++
 src/text_editor/layout.cpp                    |  1 +
 src/text_editor/main.cpp                      | 39 +++++++++++++++++--
 .../multi_cursor_text_editor_behaviors.txt    | 10 +++++
 4 files changed, 54 insertions(+), 3 deletions(-)
 create mode 100644 src/text_editor/multi_cursor_text_editor_behaviors.txt

diff --git a/src/text_editor/buffer.cpp b/src/text_editor/buffer.cpp
index 686d905..698e2b1 100644
--- a/src/text_editor/buffer.cpp
+++ b/src/text_editor/buffer.cpp
@@ -614,4 +614,11 @@ int64_t MoveUp(Buffer &buffer, int64_t pos) {
     LineAndColumn info    = FindLineAndColumn(buffer, pos);
     int64_t       new_pos = FindPos(buffer, info.line.number - 1, info.column);
     return new_pos;
+}
+
+Range EncloseWord(Buffer &buffer, int64_t pos) {
+    Range result = {};
+    result.min   = Seek(buffer, pos, ITERATE_BACKWARD);
+    result.max   = Seek(buffer, pos, ITERATE_FORWARD);
+    return result;
 }
\ No newline at end of file
diff --git a/src/text_editor/layout.cpp b/src/text_editor/layout.cpp
index f7c6b14..0471cf4 100644
--- a/src/text_editor/layout.cpp
+++ b/src/text_editor/layout.cpp
@@ -31,6 +31,7 @@ struct Window {
     float font_spacing;
     Rect2 rect;
 
+    Range         selection_anchor_point;
     bool          mouse_selecting;
     Vec2          scroll; // window_world_to_window_units
     Cursor        main_cursor_begin_frame;
diff --git a/src/text_editor/main.cpp b/src/text_editor/main.cpp
index 237d380..10ad415 100644
--- a/src/text_editor/main.cpp
+++ b/src/text_editor/main.cpp
@@ -6,6 +6,9 @@
 // @todo: add clipboard history?
 // @todo: mouse double click
 // @todo: context menu
+// @todo: scrollbars
+// @todo: line numbers
+// @todo: line wrapping
 // @todo: toy around with acme ideas
 #include "rect2.cpp"
 #include "buffer.cpp"
@@ -41,6 +44,23 @@ void Dbg_Draw() {
     }
 }
 
+bool IsDoubleClick() {
+    static double last_click_time;
+    if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
+        double time     = GetTime();
+        double diff     = time - last_click_time;
+        last_click_time = time;
+        // @todo: don't do this manually, use windows
+        if (diff >= 0.15 && diff <= 0.5) {
+            last_click_time = 0;
+            return true;
+        }
+    } else if (IsMouseButtonDown(MOUSE_BUTTON_LEFT)) {
+        last_click_time = 0;
+    }
+    return false;
+}
+
 int main() {
     InitScratch();
     InitWindow(800, 600, "Hello");
@@ -389,7 +409,6 @@ int main() {
                 For(focused_window->cursors) AddEdit(&edits, it.range, string);
                 ApplyEdits(focused_window, edits);
                 AfterEdit(focused_window, edits);
-                // For(focused_window->cursors) it.range.min = it.range.max = MoveRight(focused_window->buffer, it.range.min);
             }
             EventRecording_SimulateGetCharPressed(focused_window);
         }
@@ -442,8 +461,16 @@ int main() {
                         if (!IsKeyDown(KEY_LEFT_CONTROL)) {
                             window.cursors.clear();
                         }
-                        window.cursors.add({col->pos, col->pos});
+                        window.cursors.add(MakeCursor(col->pos, col->pos));
+                        window.selection_anchor_point = window.cursors.last()->range;
+                        if (IsDoubleClick()) {
+                            Cursor *c                     = window.cursors.last();
+                            c->range                      = EncloseWord(window.buffer, col->pos);
+                            window.selection_anchor_point = c->range;
+                        }
+
                         MergeCursors(&window);
+                    } else if (IsMouseButtonDown(MOUSE_BUTTON_LEFT)) {
                         window.mouse_selecting = true;
                     }
 
@@ -453,7 +480,13 @@ int main() {
                             window.mouse_selecting = false;
                         }
                         Cursor *cursor = window.cursors.last();
-                        cursor[0]      = ChangeFront(*cursor, col->pos);
+                        if (window.selection_anchor_point.min > col->pos) {
+                            cursor[0] = MakeCursor(col->pos, window.selection_anchor_point.max);
+                        } else if (window.selection_anchor_point.max < col->pos) {
+                            cursor[0] = MakeCursor(col->pos, window.selection_anchor_point.min);
+                        } else {
+                            cursor[0] = MakeCursor(window.selection_anchor_point.max, window.selection_anchor_point.min);
+                        }
                     }
                 }
             }
diff --git a/src/text_editor/multi_cursor_text_editor_behaviors.txt b/src/text_editor/multi_cursor_text_editor_behaviors.txt
new file mode 100644
index 0000000..bd91046
--- /dev/null
+++ b/src/text_editor/multi_cursor_text_editor_behaviors.txt
@@ -0,0 +1,10 @@
+- select word on double click - use selected word as the unselectable anchor point
+- ctrl + mouse click to add and control a new cursor
+- ctrl + alt + mouse click to do a rectangle select with multiple cursors @todo
+- mouse wheel to scroll
+- right click to open context menu with cut copy paste @todo
+- shift + alt + up arrow to create a new cursor on line above
+- ctrl + alt + up arrow to duplicate line, put it above and put cursor on it
+- alt + up arrow to move line above @todo
+- arrow to move cursor vertically or horizontally
+- shift + arrow to move and select