TextBox.hpp

//
// TGUI - Texus' Graphical User Interface
// Copyright (C) 2012-2018 Bruno Van de Velde (vdv_b@tgui.eu)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//


#ifndef TGUI_TEXT_BOX_HPP
#define TGUI_TEXT_BOX_HPP


#include <TGUI/CopiedSharedPtr.hpp>
#include <TGUI/Widgets/Scrollbar.hpp>
#include <TGUI/Renderers/TextBoxRenderer.hpp>
#include <TGUI/Text.hpp>


namespace tgui
{
 class TGUI_API TextBox : public Widget
 {
 public:

 typedef std::shared_ptr<TextBox> Ptr; 
 typedef std::shared_ptr<const TextBox> ConstPtr; 


 // Default constructor
 TextBox();


 static TextBox::Ptr create();


 static TextBox::Ptr copy(TextBox::ConstPtr textBox);


 TextBoxRenderer* getSharedRenderer();
 const TextBoxRenderer* getSharedRenderer() const;

 TextBoxRenderer* getRenderer();
 const TextBoxRenderer* getRenderer() const;


 void setSize(const Layout2d& size) override;
 using Widget::setSize;


 void setText(const sf::String& text);


 void addText(const sf::String& text);


 const sf::String& getText() const;


 sf::String getSelectedText() const;


 void setTextSize(unsigned int size);


 unsigned int getTextSize() const;


 void setMaximumCharacters(std::size_t maxChars = 0);


 std::size_t getMaximumCharacters() const;


 void setCaretPosition(std::size_t charactersBeforeCaret);


 std::size_t getCaretPosition() const;


 void setReadOnly(bool readOnly = true);


 bool isReadOnly() const;


 void setVerticalScrollbarPresent(bool present);


 bool isVerticalScrollbarPresent() const;


 std::size_t getLinesCount() const;


 void setFocused(bool focused) override;


 bool mouseOnWidget(Vector2f pos) const override;

 void leftMousePressed(Vector2f pos) override;

 void leftMouseReleased(Vector2f pos) override;

 void mouseMoved(Vector2f pos) override;

 void keyPressed(const sf::Event::KeyEvent& event) override;

 void textEntered(std::uint32_t Key) override;

 bool mouseWheelScrolled(float delta, Vector2f pos) override;

 void mouseNoLongerOnWidget() override;

 void mouseNoLongerDown() override;


 protected:


 // This function will search after which character the caret should be placed. It will not change the caret position.
 sf::Vector2<std::size_t> findCaretPosition(Vector2f position) const;


 // Converts the two dimensional selection positions into one dimensional positions in the text.
 // The first element of the pair is the selection start and the second one is the selection end.
 std::pair<std::size_t, std::size_t> findTextSelectionPositions() const;


 // This function is called when you are selecting text.
 // It will find out which part of the text is selected.
 void selectText(float posX, float posY);


 // Removes the selected characters. This function is called when pressing backspace, delete or a letter while there were
 // some characters selected.
 void deleteSelectedCharacters();


 // Rearrange the text inside the text box (by using word wrap).
 void rearrangeText(bool keepSelection);


 // This function will split the text into five pieces so that the text can be easily drawn.
 void updateSelectionTexts();


 void draw(sf::RenderTarget& target, sf::RenderStates states) const override;


 protected:

 // Returns the size without the borders
 Vector2f getInnerSize() const;


 // This function is called every frame with the time passed since the last frame.
 void update(sf::Time elapsedTime) override;


 // Recalculates the positions of the contents of the text box.
 void recalculatePositions();


 // Recalculates which lines are currently visible.
 void recalculateVisibleLines();


 Signal& getSignal(std::string signalName) override;


 void rendererChanged(const std::string& property) override;


 std::unique_ptr<DataIO::Node> save(SavingRenderersMap& renderers) const override;


 void load(const std::unique_ptr<DataIO::Node>& node, const LoadingRenderersMap& renderers) override;


 // Makes a copy of the widget
 Widget::Ptr clone() const override
 {
 return std::make_shared<TextBox>(*this);
 }


 public:

 SignalString onTextChange = {"TextChanged"}; 


 protected:

 sf::String m_text;
 unsigned int m_textSize = 18;
 unsigned int m_lineHeight = 24;

 std::vector<sf::String> m_lines;

 // The maximum characters (0 by default, which means no limit)
 std::size_t m_maxChars = 0;

 // What is known about the visible lines?
 std::size_t m_topLine = 1;
 std::size_t m_visibleLines = 1;

 // Information about the selection
 sf::Vector2<std::size_t> m_selStart;
 sf::Vector2<std::size_t> m_selEnd;

 // Information about the caret
 Vector2f m_caretPosition;
 bool m_caretVisible = true;

 Text m_textBeforeSelection;
 Text m_textSelection1;
 Text m_textSelection2;
 Text m_textAfterSelection1;
 Text m_textAfterSelection2;

 std::vector<FloatRect> m_selectionRects;

 // The scrollbar
 CopiedSharedPtr<ScrollbarChildWidget> m_verticalScroll;

 // Is there a possibility that the user is going to double click?
 bool m_possibleDoubleClick = false;

 bool m_readOnly = false;

 Sprite m_spriteBackground;

 // Cached renderer properties
 Borders m_bordersCached;
 Padding m_paddingCached;
 Color m_borderColorCached;
 Color m_backgroundColorCached;
 Color m_caretColorCached;
 Color m_selectedTextBackgroundColorCached;
 float m_caretWidthCached = 1;

 };

}


#endif // TGUI_TEXT_BOX_HPP