120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
#pragma once
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#include "RmlUi_Include_Windows.h"
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#include <RmlUi/Core/Input.h>
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#include <RmlUi/Core/StringUtilities.h>
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#include <RmlUi/Core/SystemInterface.h>
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#include <RmlUi/Core/TextInputHandler.h>
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#include <RmlUi/Core/Types.h>
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#include <string>
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class SystemInterface_Win32 : public Rml::SystemInterface {
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public:
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SystemInterface_Win32();
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~SystemInterface_Win32();
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// Optionally, provide or change the window to be used for setting the mouse cursor, clipboard text and IME position.
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void SetWindow(HWND window_handle);
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// -- Inherited from Rml::SystemInterface --
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double GetElapsedTime() override;
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void SetMouseCursor(const Rml::String& cursor_name) override;
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void SetClipboardText(const Rml::String& text) override;
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void GetClipboardText(Rml::String& text) override;
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void ActivateKeyboard(Rml::Vector2f caret_position, float line_height) override;
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private:
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HWND window_handle = nullptr;
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double time_frequency = {};
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LARGE_INTEGER time_startup = {};
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HCURSOR cursor_default = nullptr;
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HCURSOR cursor_move = nullptr;
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HCURSOR cursor_pointer = nullptr;
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HCURSOR cursor_resize = nullptr;
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HCURSOR cursor_cross = nullptr;
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HCURSOR cursor_text = nullptr;
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HCURSOR cursor_unavailable = nullptr;
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};
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class TextInputMethodEditor_Win32;
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/**
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Optional helper functions for the Win32 platform.
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*/
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namespace RmlWin32 {
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// Convenience helpers for converting between RmlUi strings (UTF-8) and Windows strings (UTF-16).
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Rml::String ConvertToUTF8(const std::wstring& wstr);
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std::wstring ConvertToUTF16(const Rml::String& str);
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// Window event handler to submit default input behavior to the context.
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// @return True if the event is still propagating, false if it was handled by the context.
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bool WindowProcedure(Rml::Context* context, TextInputMethodEditor_Win32& text_input_method_editor, HWND window_handle, UINT message, WPARAM w_param,
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LPARAM l_param);
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// Converts the key from Win32 key code to RmlUi key.
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Rml::Input::KeyIdentifier ConvertKey(int win32_key_code);
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// Returns the active RmlUi key modifier state.
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int GetKeyModifierState();
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} // namespace RmlWin32
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/**
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Custom backend implementation of TextInputHandler to handle the system's Input Method Editor (IME).
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This version supports only one active text input context.
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*/
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class TextInputMethodEditor_Win32 final : public Rml::TextInputHandler {
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public:
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TextInputMethodEditor_Win32();
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void OnActivate(Rml::TextInputContext* input_context) override;
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void OnDeactivate(Rml::TextInputContext* input_context) override;
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void OnDestroy(Rml::TextInputContext* input_context) override;
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/// Check that a composition is currently active.
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/// @return True if we are composing, false otherwise.
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bool IsComposing() const;
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void StartComposition();
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void CancelComposition();
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/// Set the composition string.
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/// @param[in] composition A string to be set.
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void SetComposition(Rml::StringView composition);
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/// End the current composition by confirming the composition string.
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/// @param[in] composition A string to confirm.
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void ConfirmComposition(Rml::StringView composition);
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/// Set the cursor position within the composition.
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/// @param[in] cursor_pos A character position of the cursor within the composition string.
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/// @param[in] update Update the cursor position within active input contexts.
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void SetCursorPosition(int cursor_pos, bool update);
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private:
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void EndComposition();
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void SetCompositionString(Rml::StringView composition);
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void UpdateCursorPosition();
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private:
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// An actively used text input method context.
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Rml::TextInputContext* input_context;
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// A flag to mark a composition is currently active.
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bool composing;
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// Character position of the cursor in the composition string.
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int cursor_pos;
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// Composition range (character position) relative to the text input value.
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int composition_range_start;
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int composition_range_end;
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};
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