Support move movement.

- Record whether the mouse moved. Suppress the previous alternative
  implementation.
- Record mouse.control modifier.

Fixed:#791

CHANGELOG.md

@@ -7,26 +7,16 @@ current (development)
 ### Component
 - Feature: Add support for `Input`'s insert mode. Add `InputOption::insert`
   option. Added by @mingsheng13.
-- Feature/Bugfix/Breaking change: `Mouse transition`:
+- Bugfix/Breaking change: `Mouse transition`:
+  - Detect when the mouse move, as opposed to being pressed.
+    The Mouse::Moved motion was added.
+  - Dragging the mouse with the left button pressed now avoids activating
+    multiple checkboxes.
+  - A couple of components are now activated when the mouse is pressed,
+  as opposed to being released.
   This fixes: https://github.com/ArthurSonzogni/FTXUI/issues/773
-  Dragging the mouse with the left button pressed now avoids activating multiple
-  checkboxes.
-
-  Add support for detecting mouse press transition. Added:
-  ```cpp
-  // The previous mouse event.
-  Mouse Mouse::previous;
-
-  // Return whether the mouse transitionned from:
-  // released to pressed => IsPressed()
-  // pressed to pressed => IsHeld()
-  // pressed to released => IsReleased()
-  bool Mouse::IsPressed(Button button) const;
-  bool Mouse::IsHeld(Button button) const;
-  bool Mouse::IsReleased(Button button) const;
-  ```
-  A couple of components are now activated when the mouse is pressed,
-  as opposed to released.
+  This fixes: https://github.com/ArthurSonzogni/FTXUI/issues/792
+- Bugfix: mouse.control is now reported correctly.
 - Feature: Add `ScreenInteractive::FullscreenPrimaryScreen()`. This allows
   displaying a fullscreen component on the primary screen, as opposed to the
   alternate screen.

CMakeLists.txt

@@ -123,7 +123,6 @@ add_library(component
   src/ftxui/component/maybe.cpp
   src/ftxui/component/menu.cpp
   src/ftxui/component/modal.cpp
-  src/ftxui/component/mouse.cpp
   src/ftxui/component/radiobox.cpp
   src/ftxui/component/radiobox.cpp
   src/ftxui/component/renderer.cpp

examples/component/print_key_press.cpp

@@ -55,6 +55,9 @@ std::string Stringify(Event event) {
       case Mouse::Released:
         out += "_released";
         break;
+      case Mouse::Moved:
+        out += "_moved";
+        break;
     }
     if (event.mouse().control)
       out += "_control";

include/ftxui/component/mouse.hpp

@@ -21,13 +21,9 @@ struct Mouse {
   enum Motion {
     Released = 0,
     Pressed = 1,
+    Moved = 2,
   };
 
-  // Utility function to check the variations of the mouse state.
-  bool IsPressed(Button btn = Left) const;   // Released => Pressed.
-  bool IsHeld(Button btn = Left) const;      // Pressed => Pressed.
-  bool IsReleased(Button btn = Left) const;  // Pressed => Released.
-
   // Button
   Button button = Button::None;
 
@@ -42,9 +38,6 @@ struct Mouse {
   // Coordinates:
   int x = 0;
   int y = 0;
-
-  // Previous mouse event, if any.
-  Mouse* previous = nullptr;
 };
 
 }  // namespace ftxui

include/ftxui/component/screen_interactive.hpp

@@ -114,7 +114,6 @@ class ScreenInteractive : public Screen {
 
   bool frame_valid_ = false;
 
-  Mouse latest_mouse_event_;
   friend class Loop;
 
  public:

src/ftxui/component/button.cpp

@@ -124,7 +124,8 @@ class ButtonBase : public ComponentBase, public ButtonOption {
       return false;
     }
 
-    if (event.mouse().IsPressed()) {
+    if (event.mouse().button == Mouse::Left &&
+        event.mouse().motion == Mouse::Pressed) {
       TakeFocus();
       OnClick();
       return true;

src/ftxui/component/checkbox.cpp

@@ -69,7 +69,8 @@ class CheckboxBase : public ComponentBase, public CheckboxOption {
       return false;
     }
 
-    if (event.mouse().IsPressed()) {
+    if (event.mouse().button == Mouse::Left &&
+        event.mouse().motion == Mouse::Pressed) {
       *checked = !*checked;
       on_change();
       return true;

src/ftxui/component/input.cpp

@@ -466,7 +466,10 @@ class InputBase : public ComponentBase, public InputOption {
       return false;
     }
 
-    if (!event.mouse().IsPressed()) {
+    if (event.mouse().button != Mouse::Left) {
+      return false;
+    }
+    if (event.mouse().motion != Mouse::Pressed) {
       return false;
     }
 

src/ftxui/component/menu.cpp

@@ -318,7 +318,9 @@ class MenuBase : public ComponentBase, public MenuOption {
 
       TakeFocus();
       focused_entry() = i;
-      if (event.mouse().IsPressed()) {
+
+      if (event.mouse().button == Mouse::Left &&
+          event.mouse().motion == Mouse::Pressed) {
         if (selected() != i) {
           selected() = i;
           selected_previous_ = selected();
@@ -682,7 +684,8 @@ Component MenuEntry(MenuEntryOption option) {
         return false;
       }
 
-      if (event.mouse().IsPressed()) {
+      if (event.mouse().button == Mouse::Left &&
+          event.mouse().motion == Mouse::Pressed) {
         TakeFocus();
         return true;
       }

src/ftxui/component/radiobox.cpp

@@ -123,7 +123,8 @@ class RadioboxBase : public ComponentBase, public RadioboxOption {
 
       TakeFocus();
       focused_entry() = i;
-      if (event.mouse().IsPressed()) {
+      if (event.mouse().button == Mouse::Left &&
+          event.mouse().motion == Mouse::Pressed) {
         if (selected() != i) {
           selected() = i;
           on_change();

src/ftxui/component/resizable_split.cpp

@@ -42,7 +42,8 @@ class ResizableSplitBase : public ComponentBase {
       return true;
     }
 
-    if (event.mouse().IsPressed() &&
+    if (event.mouse().button == Mouse::Left &&
+        event.mouse().motion == Mouse::Pressed &&
         separator_box_.Contain(event.mouse().x, event.mouse().y) &&
         !captured_mouse_) {
       captured_mouse_ = CaptureMouse(event);

src/ftxui/component/screen_interactive.cpp

@@ -715,17 +715,11 @@ void ScreenInteractive::HandleTask(Component component, Task& task) {
       if (arg.is_mouse()) {
         arg.mouse().x -= cursor_x_;
         arg.mouse().y -= cursor_y_;
-        arg.mouse().previous = &latest_mouse_event_;
       }
 
       arg.screen_ = this;
       component->OnEvent(arg);
       frame_valid_ = false;
-
-      if (arg.is_mouse()) {
-        latest_mouse_event_ = arg.mouse();
-        latest_mouse_event_.previous = nullptr;
-      }
       return;
     }
 

src/ftxui/component/slider.cpp

@@ -174,7 +174,10 @@ class SliderBase : public ComponentBase {
       return true;
     }
 
-    if (!event.mouse().IsPressed()) {
+    if (event.mouse().button != Mouse::Left) {
+      return false;
+    }
+    if (event.mouse().motion != Mouse::Pressed) {
       return false;
     }
 

src/ftxui/component/terminal_input_parser.cpp

@@ -394,13 +394,42 @@ TerminalInputParser::Output TerminalInputParser::ParseMouse(  // NOLINT
   (void)altered;
 
   Output output(MOUSE);
-  output.mouse.button = Mouse::Button((arguments[0] & 3) +          // NOLINT
-                                      ((arguments[0] & 64) >> 4));  // NOLINT
-  output.mouse.motion = Mouse::Motion(pressed);                     // NOLINT
-  output.mouse.shift = bool(arguments[0] & 4);                      // NOLINT
-  output.mouse.meta = bool(arguments[0] & 8);                       // NOLINT
-  output.mouse.x = arguments[1];                                    // NOLINT
-  output.mouse.y = arguments[2];                                    // NOLINT
+  output.mouse.motion = Mouse::Motion(pressed);  // NOLINT
+
+  // Bits value Modifer  Comment
+  // ---- ----- ------- ---------
+  // 0 1  1 2   button   0 = Left, 1 = Middle, 2 = Right, 3 = Release
+  // 2    4     Shift
+  // 3    8     Meta
+  // 4    16    Control
+  // 5    32    Move
+  // 6    64    Wheel
+
+  const bool is_move = arguments[0] & 32;  // NOLINT
+  if (is_move) {
+    output.mouse.motion = Mouse::Motion::Moved;             // NOLINT
+    output.mouse.button = Mouse::Button(arguments[0] & 3);  // NOINT
+  } else {
+    output.mouse.motion = Mouse::Motion(pressed);                     // NOLINT
+    const bool is_wheel = arguments[0] & 64;                          // NOLINT
+    output.mouse.button = Mouse::Button((arguments[0] & 3) +          // NOLINT
+                                        ((arguments[0] & 64) >> 4));  // NOLINT
+  }
+
+  //   The next three bits encode the modifiers which were down when the
+  //   button was pressed and are added together:
+  //             4=Shift,
+  //             8=Meta,
+  //             16=Control.
+  output.mouse.shift = bool(arguments[0] & 4);     // NOLINT
+  output.mouse.meta = bool(arguments[0] & 8);      // NOLINT
+  output.mouse.control = bool(arguments[0] & 16);  // NOLINT
+
+  // The next two arguments contains the coordinates directly:
+  output.mouse.x = arguments[1];  // NOLINT
+  output.mouse.y = arguments[2];  // NOLINT
+
+  // Motion event.
   return output;
 }
 

src/ftxui/component/terminal_input_parser_test.cpp

@@ -82,8 +82,7 @@ TEST(Event, MouseLeftClickPressed) {
     auto parser = TerminalInputParser(event_receiver->MakeSender());
     parser.Add('\x1B');
     parser.Add('[');
-    parser.Add('3');
-    parser.Add('2');
+    parser.Add('0');
     parser.Add(';');
     parser.Add('1');
     parser.Add('2');
@@ -103,7 +102,7 @@ TEST(Event, MouseLeftClickPressed) {
   EXPECT_FALSE(event_receiver->Receive(&received));
 }
 
-TEST(Event, MouseLeftClickReleased) {
+TEST(Event, MouseLeftMoved) {
   auto event_receiver = MakeReceiver<Task>();
   {
     auto parser = TerminalInputParser(event_receiver->MakeSender());
@@ -117,6 +116,32 @@ TEST(Event, MouseLeftClickReleased) {
     parser.Add(';');
     parser.Add('4');
     parser.Add('2');
+    parser.Add('M');
+  }
+
+  Task received;
+  EXPECT_TRUE(event_receiver->Receive(&received));
+  EXPECT_TRUE(std::get<Event>(received).is_mouse());
+  EXPECT_EQ(Mouse::Left, std::get<Event>(received).mouse().button);
+  EXPECT_EQ(12, std::get<Event>(received).mouse().x);
+  EXPECT_EQ(42, std::get<Event>(received).mouse().y);
+  EXPECT_EQ(std::get<Event>(received).mouse().motion, Mouse::Moved);
+  EXPECT_FALSE(event_receiver->Receive(&received));
+}
+
+TEST(Event, MouseLeftClickReleased) {
+  auto event_receiver = MakeReceiver<Task>();
+  {
+    auto parser = TerminalInputParser(event_receiver->MakeSender());
+    parser.Add('\x1B');
+    parser.Add('[');
+    parser.Add('0');
+    parser.Add(';');
+    parser.Add('1');
+    parser.Add('2');
+    parser.Add(';');
+    parser.Add('4');
+    parser.Add('2');
     parser.Add('m');
   }
 

src/ftxui/component/window.cpp

@@ -225,7 +225,10 @@ class WindowImpl : public ComponentBase, public WindowOptions {
       return true;
     }
 
-    if (!event.mouse().IsPressed()) {
+    if (event.mouse().button != Mouse::Left) {
+      return true;
+    }
+    if (event.mouse().motion != Mouse::Pressed) {
       return true;
     }