Squashed 'libraries/ZWidget/' changes from 02da8cdc0e..cecd34301d

cecd34301d Delay load DPI-related functions
bfc172f702 Added exception to some unimplemented functions
7c8d469bcb Added item modifications functions
847d0e6d9e Improved keyboard navigation
8c4270e0f8 Dropdown can now be closed by re-selecting it
91402c31ec Fix dropdown positioning in x11 and win32

git-subtree-dir: libraries/ZWidget
git-subtree-split: cecd34301d369400227eb0f27bad2ab41ad756d2

include/zwidget/widgets/textedit/textedit.h

@@ -0,0 +1,155 @@
+
+#pragma once
+
+#include "../../core/widget.h"
+#include "../../core/timer.h"
+#include "../../core/span_layout.h"
+#include "../../core/font.h"
+#include <functional>
+
+class Scrollbar;
+
+class TextEdit : public Widget
+{
+public:
+	TextEdit(Widget* parent);
+	~TextEdit();
+
+	bool IsReadOnly() const;
+	bool IsLowercase() const;
+	bool IsUppercase() const;
+	int GetMaxLength() const;
+	std::string GetText() const;
+	int GetLineCount() const;
+	std::string GetLineText(int line) const;
+	std::string GetSelection() const;
+	int GetSelectionStart() const;
+	int GetSelectionLength() const;
+	int GetCursorPos() const;
+	int GetCursorLineNumber() const;
+	double GetTotalHeight();
+
+	void SetSelectAllOnFocusGain(bool enable);
+	void SelectAll();
+	void SetReadOnly(bool enable = true);
+	void SetLowercase(bool enable = true);
+	void SetUppercase(bool enable = true);
+	void SetMaxLength(int length);
+	void SetText(const std::string& text);
+	void AddText(const std::string& text);
+	void SetSelection(int pos, int length);
+	void ClearSelection();
+	void SetCursorPos(int pos);
+	void DeleteSelectedText();
+	void SetInputMask(const std::string& mask);
+	void SetCursorDrawingEnabled(bool enable);
+
+	std::function<std::string(std::string text)> FuncFilterKeyChar;
+	std::function<void()> FuncBeforeEditChanged;
+	std::function<void()> FuncAfterEditChanged;
+	std::function<void()> FuncSelectionChanged;
+	std::function<void()> FuncFocusGained;
+	std::function<void()> FuncFocusLost;
+	std::function<void()> FuncEnterPressed;
+
+protected:
+	void OnPaint(Canvas* canvas) override;
+	void OnMouseMove(const Point& pos) override;
+	bool OnMouseDown(const Point& pos, InputKey key) override;
+	bool OnMouseDoubleclick(const Point& pos, InputKey key) override;
+	bool OnMouseUp(const Point& pos, InputKey key) override;
+	void OnKeyChar(std::string chars) override;
+	void OnKeyDown(InputKey key) override;
+	void OnKeyUp(InputKey key) override;
+	void OnGeometryChanged() override;
+	void OnEnableChanged() override;
+	void OnSetFocus() override;
+	void OnLostFocus() override;
+
+private:
+	void LayoutLines(Canvas* canvas);
+
+	void OnTimerExpired();
+	void OnScrollTimerExpired();
+	void CreateComponents();
+	void OnVerticalScroll();
+	void UpdateVerticalScroll();
+	void MoveVerticalScroll();
+	double GetTotalLineHeight();
+
+	struct Line
+	{
+		std::string text;
+		SpanLayout layout;
+		Rect box;
+		bool invalidated = true;
+	};
+
+	struct ivec2
+	{
+		ivec2() = default;
+		ivec2(int x, int y) : x(x), y(y) { }
+		int x = 0;
+		int y = 0;
+
+		bool operator==(const ivec2& b) const { return x == b.x && y == b.y; }
+		bool operator!=(const ivec2& b) const { return x != b.x || y != b.y; }
+	};
+
+	Scrollbar* vert_scrollbar;
+	Timer* timer = nullptr;
+	std::vector<Line> lines = { Line() };
+	ivec2 cursor_pos = { 0, 0 };
+	int max_length = -1;
+	bool mouse_selecting = false;
+	bool lowercase = false;
+	bool uppercase = false;
+	bool readonly = false;
+	ivec2 selection_start = { -1, 0 };
+	int selection_length = 0;
+	std::string input_mask;
+
+	static std::string break_characters;
+
+	void Move(int steps, bool shift, bool ctrl);
+	void InsertText(ivec2 pos, const std::string& str);
+	void Backspace();
+	void Del();
+	ivec2 GetCharacterIndex(Point mouse_wincoords);
+	ivec2 FindNextBreakCharacter(ivec2 pos);
+	ivec2 FindPreviousBreakCharacter(ivec2 pos);
+	bool InputMaskAcceptsInput(ivec2 cursor_pos, const std::string& str);
+
+	std::string::size_type ToOffset(ivec2 pos) const;
+	ivec2 FromOffset(std::string::size_type offset) const;
+
+	VerticalTextPosition vertical_text_align;
+	Timer* scroll_timer = nullptr;
+
+	bool mouse_moves_left = false;
+	bool cursor_blink_visible = true;
+	unsigned int blink_timer = 0;
+	int clip_start_offset = 0;
+	int clip_end_offset = 0;
+	bool ignore_mouse_events = false;
+
+	struct UndoInfo
+	{
+		/* set undo text when:
+		   - added char after moving
+		   - destructive block operation (del, cut etc)
+		   - beginning erase
+		*/
+
+		std::string undo_text;
+		bool first_erase = false;
+		bool first_text_insert = false;
+	} undo_info;
+
+	bool select_all_on_focus_gain = false;
+
+	std::shared_ptr<Font> font = Font::Create("NotoSans", 12.0);
+
+	template<typename T>
+	static T clamp(T val, T minval, T maxval) { return std::max<T>(std::min<T>(val, maxval), minval); }
+};