Checkbox button debounce (#774)

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.

Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

src/ftxui/component/button.cpp

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

src/ftxui/component/checkbox.cpp

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

src/ftxui/component/input.cpp

@@ -466,8 +466,7 @@ class InputBase : public ComponentBase, public InputOption {
       return false;
     }
 
-    if (event.mouse().button != Mouse::Left ||
-        event.mouse().motion != Mouse::Pressed) {
+    if (!event.mouse().IsPressed()) {
       return false;
     }
 

src/ftxui/component/menu.cpp

@@ -318,8 +318,7 @@ class MenuBase : public ComponentBase, public MenuOption {
 
       TakeFocus();
       focused_entry() = i;
-      if (event.mouse().button == Mouse::Left &&
-          event.mouse().motion == Mouse::Released) {
+      if (event.mouse().IsPressed()) {
         if (selected() != i) {
           selected() = i;
           selected_previous_ = selected();
@@ -683,8 +682,7 @@ Component MenuEntry(MenuEntryOption option) {
         return false;
       }
 
-      if (event.mouse().button == Mouse::Left &&
-          event.mouse().motion == Mouse::Released) {
+      if (event.mouse().IsPressed()) {
         TakeFocus();
         return true;
       }

src/ftxui/component/mouse.cpp

@@ -0,0 +1,36 @@
+// Copyright 2023 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
+
+#include "ftxui/component/mouse.hpp"
+
+namespace ftxui {
+
+namespace {
+bool IsDown(const Mouse* mouse, Mouse::Button btn) {
+  return mouse->button == btn && mouse->motion == Mouse::Pressed;
+}
+}  // namespace
+
+/// Return whether the mouse transitionned from released to pressed.
+/// This is useful to detect a click.
+/// @arg btn The button to check.
+bool Mouse::IsPressed(Button btn) const {
+  return IsDown(this, btn) && (!previous || !IsDown(previous, btn));
+}
+
+/// Return whether the mouse is currently held.
+/// This is useful to detect a drag.
+/// @arg btn The button to check.
+bool Mouse::IsHeld(Button btn) const {
+  return IsDown(this, btn) && previous && IsDown(previous, btn);
+}
+
+/// Return whether the mouse transitionned from pressed to released.
+/// This is useful to detect a click.
+/// @arg btn The button to check.
+bool Mouse::IsReleased(Button btn) const {
+  return !IsDown(this, btn) && (previous && IsDown(previous, btn));
+}
+
+}  // namespace ftxui

src/ftxui/component/radiobox.cpp

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

src/ftxui/component/resizable_split.cpp

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

src/ftxui/component/screen_interactive.cpp

@@ -689,11 +689,17 @@ 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

@@ -174,8 +174,7 @@ class SliderBase : public ComponentBase {
       return true;
     }
 
-    if (event.mouse().button != Mouse::Left ||
-        event.mouse().motion != Mouse::Pressed) {
+    if (!event.mouse().IsPressed()) {
       return false;
     }
 

src/ftxui/component/window.cpp

@@ -225,8 +225,7 @@ class WindowImpl : public ComponentBase, public WindowOptions {
       return true;
     }
 
-    if (event.mouse().button != Mouse::Left ||
-        event.mouse().motion != Mouse::Pressed) {
+    if (!event.mouse().IsPressed()) {
       return true;
     }