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During multi-step text input composing, such as with Chinese, Japanese, and Korean text input, the framework sends embedders cursor rect updates in the form of two messages: * TextInput.setMarkedTextRect: notifies the embedder the size and position of the composing text rect (or cursor when not composing) in local coordinates. * TextInput.setEditableSizeAndTransform: notifies the embedder of the size of the EditableText and 4x4 transform matrix from local to PipelineOwner.rootNode coordinates. On receipt of either message, we cache a local copy on the TextInputPlugin and notify the Win32FlutterWindow of the updated cursor rect. In a followup patch, we update Win32FlutterWindow to implement the Win32 input manager (IMM) calls required to position the IME candidates window while editing.
63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_WINDOW_BINDING_HANDLER_H_
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#define FLUTTER_SHELL_PLATFORM_WINDOWS_WINDOW_BINDING_HANDLER_H_
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#include <windows.h>
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#include <string>
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#include <variant>
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#include "flutter/shell/platform/common/cpp/geometry.h"
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#include "flutter/shell/platform/windows/public/flutter_windows.h"
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#include "flutter/shell/platform/windows/window_binding_handler_delegate.h"
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namespace flutter {
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class FlutterWindowsView;
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// Structure containing physical bounds of a Window
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struct PhysicalWindowBounds {
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size_t width;
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size_t height;
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};
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using WindowsRenderTarget = std::variant<
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/*winrt::Windows::UI::Composition::SpriteVisual, */ HWND>;
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// Abstract class for binding Windows platform windows to Flutter views.
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class WindowBindingHandler {
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public:
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virtual ~WindowBindingHandler() = default;
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// Sets the delegate used to communicate state changes from window to view
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// such as key presses, mouse position updates etc.
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virtual void SetView(WindowBindingHandlerDelegate* view) = 0;
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// Returns a valid WindowsRenderTarget representing the backing
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// window.
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virtual WindowsRenderTarget GetRenderTarget() = 0;
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// Returns the scale factor for the backing window.
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virtual float GetDpiScale() = 0;
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// Returns the bounds of the backing window in physical pixels.
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virtual PhysicalWindowBounds GetPhysicalWindowBounds() = 0;
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// Invoked after the window has been resized.
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virtual void OnWindowResized() = 0;
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// Sets the cursor that should be used when the mouse is over the Flutter
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// content. See mouse_cursor.dart for the values and meanings of cursor_name.
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virtual void UpdateFlutterCursor(const std::string& cursor_name) = 0;
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// Sets the cursor rect in root view coordinates.
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virtual void UpdateCursorRect(const Rect& rect) = 0;
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};
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} // namespace flutter
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#endif // FLUTTER_SHELL_PLATFORM_WINDOWS_WINDOW_BINDING_HANDLER_H_
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