1 #ifndef __DALI_TOOLKIT_TEXT_CONTROLLER_H__
2 #define __DALI_TOOLKIT_TEXT_CONTROLLER_H__
5 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
23 #include <dali/public-api/common/dali-vector.h>
24 #include <dali/public-api/common/intrusive-ptr.h>
25 #include <dali/public-api/events/key-event.h>
26 #include <dali/public-api/math/vector3.h>
27 #include <dali/public-api/math/vector2.h>
28 #include <dali/public-api/object/ref-object.h>
31 #include <dali-toolkit/internal/text/decorator/text-decorator.h>
32 #include <dali-toolkit/internal/text/font-run.h>
33 #include <dali-toolkit/internal/text/text-control-interface.h>
34 #include <dali-toolkit/internal/text/text-view.h>
48 typedef IntrusivePtr<Controller> ControllerPtr;
49 typedef Dali::Toolkit::Text::ControlInterface ControlInterface;
52 * @brief A Text Controller is used by UI Controls which display text.
54 * It manipulates the Logical & Visual text models on behalf of the UI Controls.
55 * It provides a view of the text that can be used by rendering back-ends.
57 * For selectable/editable UI controls, the controller handles input events from the UI control
58 * and decorations (grab handles etc) via an observer interface.
60 class Controller : public RefObject, public Decorator::Observer
65 * @brief Text related operations to be done in the relayout process.
69 NO_OPERATION = 0x0000,
70 CONVERT_TO_UTF32 = 0x0001,
72 VALIDATE_FONTS = 0x0004,
73 GET_LINE_BREAKS = 0x0008,
74 GET_WORD_BREAKS = 0x0010,
77 GET_GLYPH_METRICS = 0x0080,
79 UPDATE_ACTUAL_SIZE = 0x0200,
80 UPDATE_POSITIONS = 0x0400,
81 UPDATE_LINES = 0x0800,
85 ALL_OPERATIONS = 0xFFFF
91 * @brief Create a new instance of a Controller.
93 * @param[in] controlInterface An interface used to request a text relayout.
94 * @return A pointer to a new Controller.
96 static ControllerPtr New( ControlInterface& controlInterface );
99 * @brief Replaces any text previously set.
101 * @note This will be converted into UTF-32 when stored in the text model.
102 * @param[in] text A string of UTF-8 characters.
104 void SetText( const std::string& text );
107 * @brief Retrieve any text previously set.
109 * @return A string of UTF-8 characters.
111 void GetText( std::string& text ) const;
114 * @brief Replaces any placeholder text previously set.
116 * @param[in] text A string of UTF-8 characters.
118 void SetPlaceholderText( const std::string& text );
121 * @brief Retrieve any placeholder text previously set.
123 * @return A string of UTF-8 characters.
125 void GetPlaceholderText( std::string& text ) const;
128 * @brief Set the default font family.
130 * @param[in] defaultFontFamily The default font family.
132 void SetDefaultFontFamily( const std::string& defaultFontFamily );
135 * @brief Retrieve the default font family.
137 * @return The default font family.
139 const std::string& GetDefaultFontFamily() const;
142 * @brief Set the default font style.
144 * @param[in] defaultFontStyle The default font style.
146 void SetDefaultFontStyle( const std::string& defaultFontStyle );
149 * @brief Retrieve the default font style.
151 * @return The default font style.
153 const std::string& GetDefaultFontStyle() const;
156 * @brief Set the default point size.
158 * @param[in] defaultFontStyle The default point size.
160 void SetDefaultPointSize( float pointSize );
163 * @brief Retrieve the default point size.
165 * @return The default point size.
167 float GetDefaultPointSize() const;
170 * @brief Retrieve the default fonts.
172 * @param[out] fonts The default font family, style and point sizes.
173 * @param[in] numberOfCharacters The number of characters in the logical model.
175 void GetDefaultFonts( Dali::Vector<FontRun>& fonts, Length numberOfCharacters );
178 * @brief Called to enable text input.
180 * @note Only selectable or editable controls should calls this.
181 * @param[in] decorator Used to create cursor, selection handle decorations etc.
183 void EnableTextInput( DecoratorPtr decorator );
186 * @brief Triggers a relayout which updates View (if necessary).
188 * @note UI Controls are expected to minimize calls to this method e.g. call once after size negotiation.
189 * @param[in] size A the size of a bounding box to layout text within.
190 * @return True if the text model or decorations were updated.
192 bool Relayout( const Vector2& size );
195 * @brief Lays-out the text.
197 * GetNaturalSize(), GetHeightForWidth() and Relayout() calls this method.
199 * @param[in] size A the size of a bounding box to layout text within.
200 * @param[in] operations The layout operations which need to be done.
201 * @param[out] layoutSize The size of the laid-out text.
203 bool DoRelayout( const Vector2& size,
204 OperationsMask operations,
208 * @copydoc Control::GetNaturalSize()
210 Vector3 GetNaturalSize();
213 * @copydoc Control::GetHeightForWidth()
215 float GetHeightForWidth( float width );
218 * @brief Return the layout engine.
220 * @return A reference to the layout engine.
222 LayoutEngine& GetLayoutEngine();
225 * @brief Return a view of the text.
227 * @return A reference to the view.
232 * @brief Caller by editable UI controls when keyboard focus is gained.
234 void KeyboardFocusGainEvent();
237 * @brief Caller by editable UI controls when focus is lost.
239 void KeyboardFocusLostEvent();
242 * @brief Caller by editable UI controls when key events are received.
244 * @param[in] event The key event.
246 bool KeyEvent( const Dali::KeyEvent& event );
249 * @brief Caller by editable UI controls when a tap gesture occurs.
250 * @param[in] tapCount The number of taps.
251 * @param[in] x The x position relative to the top-left of the parent control.
252 * @param[in] y The y position relative to the top-left of the parent control.
254 void TapEvent( unsigned int tapCount, float x, float y );
257 * @copydoc Dali::Toolkit::Text::Decorator::Observer::GrabHandleEvent()
259 virtual void GrabHandleEvent( GrabHandleState state, float x, float y );
264 * @brief A reference counted object may only be deleted by calling Unreference().
266 virtual ~Controller();
271 * @brief Request a relayout using the ControlInterface.
273 void RequestRelayout();
276 * @brief Private constructor.
278 Controller( ControlInterface& controlInterface );
281 Controller( const Controller& handle );
284 Controller& operator=( const Controller& handle );
291 // Avoid allocating this when the user does not specify a font
294 // Avoid allocating this for non-editable controls
300 } // namespace Toolkit
304 #endif // __DALI_TOOLKIT_TEXT_CONTROLLER_H__