ListBox.hpp

 
//
// TGUI - Texus' Graphical User Interface
// Copyright (C) 2012-2022 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_LIST_BOX_HPP
#define TGUI_LIST_BOX_HPP
 
 
#include <TGUI/CopiedSharedPtr.hpp>
#include <TGUI/Widgets/Scrollbar.hpp>
#include <TGUI/Renderers/ListBoxRenderer.hpp>
#include <TGUI/Text.hpp>
 
 
namespace tgui
{
 class TGUI_API ListBox : public Widget
 {
 public:
 
 using Ptr = std::shared_ptr<ListBox>; 
 using ConstPtr = std::shared_ptr<const ListBox>; 
 
 static constexpr const char StaticWidgetType[] = "ListBox"; 
 
 
 enum class TextAlignment
 {
 Left, 
 Center, 
 Right 
 };
 
 
 ListBox(const char* typeName = StaticWidgetType, bool initRenderer = true);
 
 
 static ListBox::Ptr create();
 
 
 static ListBox::Ptr copy(const ListBox::ConstPtr& listBox);
 
 
 ListBoxRenderer* getSharedRenderer();
 const ListBoxRenderer* getSharedRenderer() const;
 
 ListBoxRenderer* getRenderer();
 
 
 void setSize(const Layout2d& size) override;
 using Widget::setSize;
 
 
 std::size_t addItem(const String& itemName, const String& id = "");
 
 
 bool setSelectedItem(const String& itemName);
 
 
 bool setSelectedItemById(const String& id);
 
 
 bool setSelectedItemByIndex(std::size_t index);
 
 
 void deselectItem();
 
 
 bool removeItem(const String& itemName);
 
 
 bool removeItemById(const String& id);
 
 
 bool removeItemByIndex(std::size_t index);
 
 
 void removeAllItems();
 
 
 String getItemById(const String& id) const;
 
 
 String getItemByIndex(std::size_t index) const;
 
 
 int getIndexById(const String& id) const;
 
 
 String getIdByIndex(std::size_t index) const;
 
 
 String getSelectedItem() const;
 
 
 String getSelectedItemId() const;
 
 
 int getSelectedItemIndex() const;
 
 
 bool changeItem(const String& originalValue, const String& newValue);
 
 
 bool changeItemById(const String& id, const String& newValue);
 
 
 bool changeItemByIndex(std::size_t index, const String& newValue);
 
 
 std::size_t getItemCount() const;
 
 
 std::vector<String> getItems() const;
 
 
 std::vector<String> getItemIds() const;
 
 
 void setItemData(std::size_t index, Any data);
 
 
 template <typename T>
 T getItemData(std::size_t index) const
 {
 if (index < m_items.size())
 return AnyCast<T>(m_items[index].data);
 else
 throw std::bad_cast();
 }
 
 void setItemHeight(unsigned int itemHeight);
 
 
 unsigned int getItemHeight() const;
 
 
 void setMaximumItems(std::size_t maximumItems = 0);
 
 
 std::size_t getMaximumItems() const;
 
 
 void setAutoScroll(bool autoScroll);
 
 
 bool getAutoScroll() const;
 
 
 void setTextAlignment(TextAlignment alignment);
 
 
 TextAlignment getTextAlignment() const;
 
 
 bool contains(const String& item) const;
 
 
 bool containsId(const String& id) const;
 
 
 void setScrollbarValue(unsigned int value);
 
 
 unsigned int getScrollbarValue() const;
 
 
 bool isMouseOnWidget(Vector2f pos) const override;
 
 void leftMousePressed(Vector2f pos) override;
 
 void leftMouseReleased(Vector2f pos) override;
 
 void mouseMoved(Vector2f pos) override;
 
 bool mouseWheelScrolled(float delta, Vector2f pos) override;
 
 void mouseNoLongerOnWidget() override;
 
 void leftMouseButtonNoLongerDown() override;
 
 void keyPressed(const Event::KeyEvent& event) override;
 
 
 void draw(BackendRenderTarget& target, RenderStates states) const override;
 
 
 protected:
 
 Signal& getSignal(String signalName) override;
 
 
 void rendererChanged(const 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;
 
 
 void updateTextSize() override;
 
 
 // Returns the size without the borders
 Vector2f getInnerSize() const;
 
 
 // Updates the position of the items and the scrollbar
 void updateItemPositions();
 
 
 // Update the colors and text style of the selected and hovered items
 void updateSelectedAndHoveringItemColorsAndStyle();
 
 
 // Update the color and text style of all the items
 void updateItemColorsAndStyle();
 
 
 // Update on which item the mouse is standing
 void updateHoveringItem(int item);
 
 
 // Update which item is selected
 void updateSelectedItem(int item);
 
 
 // Checks whether the scrollbar value was changed and emit the onScroll event if it did
 void triggerOnScroll();
 
 
 // This function is called every frame with the time passed since the last frame.
 bool updateTime(Duration elapsedTime) override;
 
 
 // Makes a copy of the widget
 Widget::Ptr clone() const override;
 
 
 public:
 
 SignalItem onItemSelect = {"ItemSelected"}; 
 SignalItem onMousePress = {"MousePressed"}; 
 SignalItem onMouseRelease = {"MouseReleased"}; 
 SignalItem onDoubleClick = {"DoubleClicked"}; 
 SignalUInt onScroll = {"Scrolled"}; 
 
 
 protected:
 
 struct Item
 {
 Text text;
 Any data;
 String id;
 };
 
 std::vector<Item> m_items;
 
 // What is the index of the selected item?
 // This is also used by combo box, so it can't just be changed to a pointer!
 int m_selectedItem = -1;
 
 int m_hoveringItem = -1;
 
 unsigned int m_itemHeight = 0;
 
 // This will store the maximum number of items in the list box (zero by default, meaning that there is no limit)
 std::size_t m_maxItems = 0;
 
 // When there are too many items a scrollbar will be shown
 CopiedSharedPtr<ScrollbarChildWidget> m_scroll;
 unsigned int m_lastScrollbarValue = 0;
 
 // Will be set to true after the first click, but gets reset to false when the second click does not occur soon after
 bool m_possibleDoubleClick = false;
 
 bool m_autoScroll = true;
 ListBox::TextAlignment m_textAlignment = ListBox::TextAlignment::Left;
 
 Sprite m_spriteBackground;
 
 // Cached renderer properties
 Borders m_bordersCached;
 Borders m_paddingCached;
 Color m_borderColorCached;
 Color m_backgroundColorCached;
 Color m_backgroundColorHoverCached;
 Color m_selectedBackgroundColorCached;
 Color m_selectedBackgroundColorHoverCached;
 Color m_textColorCached;
 Color m_textColorHoverCached;
 Color m_selectedTextColorCached;
 Color m_selectedTextColorHoverCached;
 TextStyles m_textStyleCached;
 TextStyles m_selectedTextStyleCached;
 
 };
 
}
 
 
#endif // TGUI_LIST_BOX_HPP