Selection2 the come back

CMakeLists.txt

@@ -88,6 +88,7 @@ add_library(dom
   src/ftxui/dom/paragraph.cpp
   src/ftxui/dom/reflect.cpp
   src/ftxui/dom/scroll_indicator.cpp
+  src/ftxui/dom/selectable.cpp
   src/ftxui/dom/separator.cpp
   src/ftxui/dom/size.cpp
   src/ftxui/dom/spinner.cpp

examples/component/CMakeLists.txt

@@ -38,6 +38,7 @@ example(radiobox)
 example(radiobox_in_frame)
 example(renderer)
 example(resizable_split)
+example(selectable_input)
 example(scrollbar)
 example(slider)
 example(slider_direction)

examples/component/selectable_input.cpp

@@ -0,0 +1,72 @@
+// Copyright 2020 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 <string>  // for char_traits, operator+, string, basic_string
+
+#include "ftxui/component/component.hpp"       // for Input, Renderer, Vertical
+#include "ftxui/component/component_base.hpp"  // for ComponentBase
+#include "ftxui/component/component_options.hpp"  // for InputOption
+#include "ftxui/component/screen_interactive.hpp"  // for Component, ScreenInteractive
+#include "ftxui/dom/elements.hpp"  // for text, hbox, separator, Element, operator|, vbox, border
+#include "ftxui/util/ref.hpp"  // for Ref
+
+int main() {
+  using namespace ftxui;
+
+  // The data:
+  std::string first_name;
+  std::string last_name;
+  std::string password;
+  std::string phoneNumber;
+  // Region selection;
+  std::string textToCopy;
+
+  auto screen = ScreenInteractive::TerminalOutput();
+
+  // The basic input components:
+  Component input_first_name = Input(&first_name, "first name");
+  Component input_last_name = Input(&last_name, "last name");
+
+  // The password input component:
+  InputOption password_option;
+  password_option.password = true;
+  Component input_password = Input(&password, "password", password_option);
+
+  // The phone number input component:
+  // We are using `CatchEvent` to filter out non-digit characters.
+  Component input_phone_number = Input(&phoneNumber, "phone number");
+  input_phone_number |= CatchEvent([&](const Event& event) {
+    return event.is_character() && !std::isdigit(event.character()[0]);
+  });
+  input_phone_number |= CatchEvent([&](const Event& event) {
+    return event.is_character() && phoneNumber.size() > 10;
+  });
+
+  // The component tree:
+  auto component = Container::Vertical({
+      input_first_name,
+      input_last_name,
+      input_password,
+      input_phone_number,
+  });
+
+  // Tweak how the component tree is rendered:
+  auto renderer = Renderer(component, [&] {
+    return vbox({
+               hbox(text(" First name : "), input_first_name->Render()),
+               hbox(text(" Last name  : ") | selectable(),
+                    input_last_name->Render()),
+               hbox(text(" Password   : "), input_password->Render()),
+               hbox(text(" Phone num  : "), input_phone_number->Render()) |
+                   selectable(),
+               separator(),
+               text("Hello " + first_name + " " + last_name),
+               text("Your password is " + password),
+               text("Your phone number is " + phoneNumber),
+               text("Selected test is " + screen.GetSelection()),
+           }) |
+           border;
+  });
+
+  screen.Loop(renderer);
+}

include/ftxui/component/screen_interactive.hpp

@@ -26,6 +26,13 @@
 using Component = std::shared_ptr<ComponentBase>;
 class ScreenInteractivePrivate;
 
+typedef struct {
+  uint16_t startx = 0;
+  uint16_t endx = 0;
+  uint16_t starty = 0;
+  uint16_t endy = 0;
+} Region;
+
 class ScreenInteractive : public Screen {
  public:
   // Constructors:
@@ -68,6 +75,8 @@
   void ForceHandleCtrlC(bool force);
   void ForceHandleCtrlZ(bool force);
 
+  std::string GetSelection();
+
  private:
   void ExitNow();
 
@@ -82,6 +91,8 @@
   void RunOnceBlocking(Component component);
 
   void HandleTask(Component component, Task& task);
+  bool HandleSelection(Event event);
+  void RefreshSelection();
   void Draw(Component component);
   void ResetCursorPosition();
 
@@ -126,6 +137,11 @@
   bool force_handle_ctrl_c_ = true;
   bool force_handle_ctrl_z_ = true;
 
+  bool selection_enabled = false;
+  CapturedMouse selection_pending;
+  Region selection_region;
+  std::string selection_text;
+
   // The style of the cursor to restore on exit.
   int cursor_reset_shape_ = 1;
 

include/ftxui/dom/elements.hpp

@@ -113,6 +113,8 @@ Decorator focusPositionRelative(float x, float y);
 Element automerge(Element child);
 Decorator hyperlink(std::string link);
 Element hyperlink(std::string link, Element child);
+Element selectable(Element child);
+Decorator selectable(void);
 
 // --- Layout is
 // Horizontal, Vertical or stacked set of elements.

include/ftxui/dom/node.hpp

@@ -52,6 +52,12 @@ class Node {
   };
   virtual void Check(Status* status);
 
+  // Selection.
+  // Propagated from Parents to Children.
+  virtual void Select(Box selected_area) {
+    // TODO: Implement this.
+  }
+
  protected:
   Elements children_;
   Requirement requirement_;

include/ftxui/screen/pixel.hpp

@@ -13,14 +13,15 @@
 /// @brief A Unicode character and its associated style.
 /// @ingroup screen
 struct Pixel {
   Pixel()
       : blink(false),
         bold(false),
         dim(false),
         inverted(false),
         underlined(false),
         underlined_double(false),
         strikethrough(false),
+        selectable(false),
         automerge(false) {}
 
   // A bit field representing the style:
@@ -30,7 +31,8 @@
   bool inverted : 1;
   bool underlined : 1;
   bool underlined_double : 1;
+  bool selectable : 1;
   bool strikethrough : 1;
   bool automerge : 1;
 
   // The hyperlink associated with the pixel.

src/ftxui/component/screen_interactive.cpp

@@ -351,7 +351,8 @@ ScreenInteractive::ScreenInteractive(int dimx,
                                      bool use_alternative_screen)
     : Screen(dimx, dimy),
       dimension_(dimension),
-      use_alternative_screen_(use_alternative_screen) {
+      use_alternative_screen_(use_alternative_screen),
+      selection_text("") {
   task_receiver_ = MakeReceiver<Task>();
 }
 
@@ -781,7 +782,9 @@ void ScreenInteractive::HandleTask(Component component, Task& task) {
 
       arg.screen_ = this;
 
-      const bool handled = component->OnEvent(arg);
+      bool handled = component->OnEvent(arg);
+
+      handled = handled || HandleSelection(arg);
 
       if (arg == Event::CtrlC && (!handled || force_handle_ctrl_c_)) {
         RecordSignal(SIGABRT);
@@ -824,6 +827,80 @@ void ScreenInteractive::HandleTask(Component component, Task& task) {
   // clang-format on
 }
 
+// private
+bool ScreenInteractive::HandleSelection(Event event) {
+  if (!event.is_mouse()) {
+    return false;
+  }
+
+  auto& mouse = event.mouse();
+  if (mouse.button != Mouse::Left) {
+    return false;
+  }
+
+  if (mouse.motion == Mouse::Pressed) {
+    selection_pending = CaptureMouse();
+    if (!selection_pending) {
+      return false;
+    }
+    selection_enabled = true;
+    selection_region.startx = mouse.x;
+    selection_region.starty = mouse.y;
+    selection_region.endx = mouse.x;
+    selection_region.endy = mouse.y;
+    return true;
+  }
+
+  if (!selection_pending) {
+    return false;
+  }
+
+  if (mouse.motion == Mouse::Moved) {
+    selection_region.endx = mouse.x;
+    selection_region.endy = mouse.y;
+    return true;
+  }
+
+  if (mouse.motion == Mouse::Released) {
+    selection_region.endx = mouse.x;
+    selection_region.endy = mouse.y;
+    selection_pending = nullptr;
+
+    if (selection_region.startx == selection_region.endx &&
+        selection_region.starty == selection_region.endy) {
+      selection_enabled = false;
+      return true;
+    }
+
+    return true;
+  }
+
+  return false;
+}
+
+void ScreenInteractive::RefreshSelection() {
+  if (!selection_enabled) {
+    return;
+  }
+  selection_text = "";
+
+  for (int y = std::min(selection_region.starty, selection_region.endy);
+       y <= std::max(selection_region.starty, selection_region.endy); ++y) {
+    for (int x = std::min(selection_region.startx, selection_region.endx);
+         x <= std::max(selection_region.startx, selection_region.endx) - 1;
+         ++x) {
+      if (PixelAt(x, y).selectable == true) {
+        PixelAt(x, y).inverted ^= true;
+        selection_text += PixelAt(x, y).character;
+      }
+    }
+  }
+}
+
+std::string ScreenInteractive::GetSelection() {
+  return selection_text;
+}
+
 // private
 // NOLINTNEXTLINE
 void ScreenInteractive::Draw(Component component) {
@@ -894,6 +971,8 @@ void ScreenInteractive::Draw(Component component) {
 
   Render(*this, document);
 
+  RefreshSelection();
+
   // Set cursor position for user using tools to insert CJK characters.
   {
     const int dx = dimx_ - 1 - cursor_.x + int(dimx_ != terminal.dimx);

src/ftxui/dom/selectable.cpp

@@ -0,0 +1,39 @@
+#include "ftxui/dom/elements.hpp"  // for Element, Decorator
+#include "ftxui/dom/node_decorator.hpp"  // for NodeDecorator
+#include "ftxui/component/event.hpp"           // for Event
+
+
+namespace ftxui {
+namespace {
+
+class Selectable : public NodeDecorator {
+ public:
+  explicit Selectable(Element child)
+      : NodeDecorator(std::move(child)) {}
+
+ private:
+  void Render(Screen& screen) override {
+
+    for (int y = box_.y_min; y <= box_.y_max; ++y) {
+        for (int x = box_.x_min; x <= box_.x_max; ++x) {
+            screen.PixelAt(x, y).selectable = true;
+        }
+    }
+
+    NodeDecorator::Render(screen);
+  }
+};
+
+}  // namespace
+
+
+Element selectable(Element child) {
+  return std::make_shared<Selectable>(std::move(child));
+}
+
+Decorator selectable(void) {
+  return
+      [](Element child) { return selectable(std::move(child)); };
+}
+
+}  // namespace ftxui