1 #ifndef __DALI_TOOLKIT_TEXT_VIEW_H__
2 #define __DALI_TOOLKIT_TEXT_VIEW_H__
5 // Copyright (c) 2014 Samsung Electronics Co., Ltd.
7 // Licensed under the Flora License, Version 1.0 (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://floralicense.org/license/
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.
21 * @addtogroup CAPI_DALI_TOOLKIT_TEXT_VIEW_MODULE
29 #include <dali-toolkit/public-api/controls/alignment/alignment.h>
30 #include <dali-toolkit/public-api/markup-processor/markup-processor.h>
32 namespace Dali DALI_IMPORT_API
38 namespace Internal DALI_INTERNAL
44 * @brief TextView is a layout container for text with alignment, multi-line wrapping and formatting support.
46 * Different multi-line and exceed policies could be chosen to represent the given text.
47 * \see Toolkit::TextView::SetMultilinePolicy \see Toolkit::TextView::SetExceedPolicy
49 * Multi-line policies:
51 * <li>\e Split by new line character.
52 * Text will split when a '\\n' character is found.
54 * <li>\e Split by word.
55 * Text will split when a '\\n' character is found or if the text doesn't fit in the text view width.
56 * In that case, some words will be moved to a new line.
58 * <li>\e Split by character.
59 * Text will split when a '\\n' character is found or if the text doesn't fit in the text view width.
60 * In that case, words which doesn't fit will be split in two and the remaining text moved to a new line.
63 * Exceed policies work in combination with multi-line policies:
65 * <li>\e Original size.
66 * Text will be displayed with its original size.
69 * Text will be truncated.
72 * Text will be faded out.
75 * Text will be split and moved to a new line.
77 * <li>\e Shrink to fit.
78 * Text will be shrink to fit in the text view's boundary.
80 * <li>\e EllipsizeEnd.
81 * Text will be ellipsized at the end.
85 * Text alignment could be set to align the whole text block inside the text view's boundary. \see Toolkit::TextView::SetTextAlignment.
87 * Line justification could be set to align lines inside a text block. \see Toolkit::TextView::SetLineJustification.
89 * A default font could be set through the \see Toolkit::TextView::SetFont method. If any font is set, text view automatically detects a suitable font for every character.
92 * 1) Use the font specified in text decoration.
93 * 2) Use automatic font detection.
95 * Integration with other classes (GetSizeAndPositionTable )
97 * Text decoration ( Color, Font, Size, italic and all features supported in TextActor )
99 class TextView : public Control
104 static const char* const SIGNAL_TEXT_SCROLLED; ///< Signal emitted when the scroll position changes. @see SignalScrolled()
107 static const Property::Index PROPERTY_MARKUP_ENABLED; ///< name "markup-enabled", @see SetMarkupProcessingEnabled(), type BOOLEAN
108 static const Property::Index PROPERTY_TEXT; ///< name "text", type STRING
109 static const Property::Index PROPERTY_MULTILINE_POLICY; ///< name "multiline-policy", type STRING
110 static const Property::Index PROPERTY_WIDTH_EXCEED_POLICY; ///< name "width-exceed-policy", type STRING
111 static const Property::Index PROPERTY_HEIGHT_EXCEED_POLICY; ///< name "height-exceed-policy", type STRING
112 static const Property::Index PROPERTY_LINE_JUSTIFICATION; ///< name "line-justification", type STRING
113 static const Property::Index PROPERTY_FADE_BOUNDARY; ///< name "fade-boundary", type VECTOR4
114 static const Property::Index PROPERTY_LINE_HEIGHT_OFFSET; ///< name "line-height-offset", type FLOAT
115 static const Property::Index PROPERTY_HORIZONTAL_ALIGNMENT; ///< name "horizontal-alignment", type STRING
116 static const Property::Index PROPERTY_VERTICAL_ALIGNMENT; ///< name "vertical-alignment", type STRING
119 * @brief Structure used to retrieve Layout info per character.
121 struct CharacterLayoutInfo
124 * @brief Default constructor.
126 * Initializes all members to their default values.
128 CharacterLayoutInfo();
131 * @brief Empty destructor.
133 * @note Added to increase coverage.
135 ~CharacterLayoutInfo();
138 * @brief Copy constructor.
140 CharacterLayoutInfo( const CharacterLayoutInfo& characterLayoutInfo );
143 * @brief Assignment operator.
145 CharacterLayoutInfo& operator=( const CharacterLayoutInfo& character );
148 * @brief Constructor.
150 * @param[in] size of the character.
151 * @param[in] position of the character.
152 * @param[in] isNewLineChar Whether the character is a new line character.
153 * @param[in] isRightToLeftCharacter Whether is a right to left character.
154 * @param[in] visible Whether is visible.
155 * @param[in] descender of the character (distance from the base line to the bottom of the character.)
157 CharacterLayoutInfo( const Size& size,
158 const Vector3& position,
160 bool isRightToLeftCharacter,
164 Size mSize; ///< Size of the group of characters.
165 Vector3 mPosition; ///< Position of the group of characters within the text view.
166 bool mIsNewLineChar:1; ///< Whether this group of characters represent a new line.
167 bool mIsRightToLeftCharacter:1; ///< Whether it's a right-to-left character.
168 bool mIsVisible:1; ///< Whether this group of characters is visible or not.
169 float mDescender; ///< The character's descender which is the distance from the baseline to the bottom of the character
172 typedef std::vector<CharacterLayoutInfo> CharacterLayoutInfoContainer; ///< Container of Character layouts
175 * @brief Stores some info about a laid-out line.
177 struct LineLayoutInfo
179 std::size_t mCharacterGlobalIndex; ///< Global index within the whole text of the first character of current laid-out line.
180 Size mSize; ///< Size of the current laid-out line.
181 float mAscender; ///< The max ascender of the current laid-out line.
184 typedef std::vector<LineLayoutInfo> LineLayoutInfoContainer; ///< Container of line layouts
187 * @brief How text is laid out.
189 struct TextLayoutInfo
192 * @brief Default constructor.
197 * @brief Empty destructor.
199 * @note Added to increase coverage.
204 * @brief Copy constructor.
206 TextLayoutInfo( const TextLayoutInfo& textLayoutInfo );
209 * @brief Assignment operator.
211 TextLayoutInfo& operator=( const TextLayoutInfo& textLayoutInfo );
213 CharacterLayoutInfoContainer mCharacterLayoutInfoTable; ///< The table of character positions and sizes sorted by the characters' visual index.
214 LineLayoutInfoContainer mLines; ///< For each laid-out line, it stores an index to the first character of the line.
215 std::vector<int> mCharacterLogicalToVisualMap; ///< The map to store the character's logical (input) index according to its visual (reordered) index.
216 std::vector<int> mCharacterVisualToLogicalMap; ///< The map to store the character's visual (reordered) index according to its logical (input) index.
217 Size mTextSize; ///< Text size after relayout.
218 Vector2 mScrollOffset; ///< Scroll's position.
222 * @brief This structure represents a fade boundary.
224 * If Exceed policy is set to Fade all text which does not fit within the text-view fade boundary is faded out. Text which exceeds the text-view boundary becomes invisible.
225 * The \e left, \e right, \e top and \e bottom values are positive, in pixels and set the distances between the text-view and fade boundaries.
230 * @brief Default constructor.
232 * Initializes all values to 0. It means no fade boundary.
237 * @brief Constructor.
239 * Initializes the fade boundary with the given values.
241 * @param[in] left value in pixels.
242 * @param[in] right value in pixels.
243 * @param[in] top value in pixels.
244 * @param[in] bottom value in pixels.
246 FadeBoundary( PixelSize left, PixelSize right, PixelSize top, PixelSize bottom );
248 PixelSize mLeft; ///< The left fade boundary
249 PixelSize mRight; ///< The right fade boundary
250 PixelSize mTop; ///< The top fade boundary
251 PixelSize mBottom; ///< The bottom fade bounday
255 * @brief Define how to split the text in lines.
257 * SplitByNewLineChar will split the text in lines when a '\\n' character is found.
258 * SplitByWord has effect only when TextView size is assigned.
259 * It will split the text in lines when a '\\n' character is found or if a line exceeds the TextView's boundary. This option won't split a word in two.
260 * SplitByChar has effect only when TextView size is assigned.
261 * It will split the text in lines when a '\\n' character is found or if a line exceeds the TextView's boundary. This option might split a word in two.
262 * The default value is SplitByNewLineChar.
266 SplitByNewLineChar, ///< Text lines will split when '\\n' character is found.
267 SplitByWord, ///< Text lines will split by word or if '\\n' character is found. It has effect only when TextView size is assigned.
268 SplitByChar ///< Text lines will split by char or if '\\n' character is found. It has effect only when TextView size is assigned.
272 * @brief Define how to display the text when it doesn't fit inside the TextView.
274 * The default value is ShrinkToFit.
278 Original, ///< Will display the text in its original size. If a line, a word or a character is bigger than the TextView size it may exceed its boundary.
279 Truncate, ///< Will display the text in its original size. It won't display the text which exceeds the TextView boundary.
280 Fade, ///< Will display the text in its original size. It won't display the text which exceeds the TextView boundary. It fades the text out.
281 Split, ///< Will split the text in a new line.
282 ShrinkToFit, ///< Will shrink the text to fit the TextView boundary.
283 EllipsizeEnd ///< Will ellipsize the text by the end.
287 * @brief Define how to justify lines inside the text area.
289 * The default value is Left.
291 enum LineJustification
293 Left, ///< Justify to the left.
294 Center, ///< Centered.
295 Right, ///< Justify to the right.
296 Justified ///< Line justified.
301 * @brief Create an TextView handle; this can be initialised with TextView::New().
303 * Calling member functions with an uninitialised Dali::Object handle is not allowed.
308 * @brief Copy constructor.
310 * Creates another handle that points to the same real object
311 * @param[in] handle The handle to copy from
313 TextView( const TextView& handle );
316 * @brief Assignment operator.
318 * Changes this handle to point to another real object
319 * @param[in] handle The handle to copy from
320 * @return a reference to this
322 TextView& operator=( const TextView& handle );
325 * @brief Create a TextView control with no text.
327 * @return A handle the TextView control.
329 static TextView New();
332 * @brief Create a TextView control.
334 * @param[in] text to display.
335 * @return A handle the TextView control.
337 static TextView New( const std::string& text );
340 * @copydoc TextView New( const std::string& text )
342 static TextView New( const MarkupProcessor::StyledTextArray& text );
345 * @brief Downcast an Object handle to TextView.
347 * If handle points to a TextView the
348 * downcast produces valid handle. If not the returned handle is left uninitialized.
349 * @param[in] handle Handle to an object
350 * @return handle to a TextView or an uninitialized handle
352 static TextView DownCast( BaseHandle handle );
355 * @brief Virtual destructor.
357 * Dali::Object derived classes typically do not contain member data.
362 * @brief Replace the current text with a new text string.
364 * @param[in] text to display. The string may contain style tags.
366 void SetText( const std::string& text );
369 * @brief Replace the current text with a new text string with style.
371 * @param[in] text with style to display.
373 void SetText( const MarkupProcessor::StyledTextArray& text );
376 * @brief Inserts the given text in the specified position.
378 * @param[in] position Where the given text is going to be added.
379 * @param[in] text The text to be added.
381 void InsertTextAt( std::size_t position, const std::string& text );
384 * @copydoc InsertTextAt( std::size_t position, const std::string& text )
386 void InsertTextAt( std::size_t position, const MarkupProcessor::StyledTextArray& text );
389 * @brief Replaces part of the text.
391 * It removes the specified number of characters from the given position and inserts the given text in the same specified position.
393 * @param[in] position of the first character to be removed and Where the given text is going to be added.
394 * @param[in] numberOfCharacters number of characters to be removed.
395 * @param[in] text The text to be added.
397 void ReplaceTextFromTo( std::size_t position, std::size_t numberOfCharacters, const std::string& text );
400 * @copydoc ReplaceTextFromTo( std::size_t position, std::size_t numberOfCharacters, const std::string& text )
402 void ReplaceTextFromTo( std::size_t position, std::size_t numberOfCharacters, const MarkupProcessor::StyledTextArray& text );
405 * @brief Removes the specified number of characters from the given position.
407 * @param[in] position of the first character to be removed.
408 * @param[in] numberOfCharacters number of characters to be removed.
410 void RemoveTextFrom( std::size_t position, std::size_t numberOfCharacters );
413 * @brief Get the currently displayed text.
415 * @return The currently displayed text.
417 std::string GetText() const;
420 * @brief Sets a line height offset.
422 * The line height offset will be added to the font line height.
423 * @param [in] offset The height offset in PointSize units.
425 void SetLineHeightOffset( PointSize offset );
428 * @brief Retrieves the line height offset.
430 * @return The line height offset in PointSize units.
432 PointSize GetLineHeightOffset() const;
435 * @brief Sets the given style to the current text.
437 * By default all style settings are applied but a bit mask could be used to modify only certain style settings.
438 * @note TextView doesn't store a copy of the given style, it applies the given style to the current text only.
439 * Subsequent calls to SetText() will override any style set by this method.
440 * @param[in] style The given style
441 * @param[in] mask The bit mask.
443 void SetStyleToCurrentText( const TextStyle& style, TextStyle::Mask mask = TextStyle::ALL );
446 * @brief Set the current text alignment.
448 * Default alignment is (HorizontalCenter | VerticalCenter)
449 * @param[in] align The new alignment option.
451 void SetTextAlignment( Alignment::Type align );
454 * @brief Get the current text alignment combined into a single value.
456 * The values can be tested by using the & operator
457 * and the desired flag. e.g. if (GetTextAlignment() & HorizontalCentre) ...
458 * @return the combined alignment
460 Alignment::Type GetTextAlignment() const;
463 * @brief Sets how to split the text in lines policy.
465 * @param policy The multi-line policy. SplitByNewLineChar is set by default.
467 void SetMultilinePolicy( MultilinePolicy policy );
470 * @brief Gets the split in lines policy.
472 * @return The multi-line policy.
474 MultilinePolicy GetMultilinePolicy() const;
477 * @brief Sets how to display the text inside the TextView when it exceeds the text-view's width.
479 * @param policy The exceed policy. Original is set by default.
481 void SetWidthExceedPolicy( ExceedPolicy policy );
484 * @brief Gets the width exceed policy.
486 * @return The exceed policy.
488 ExceedPolicy GetWidthExceedPolicy() const;
491 * @brief Sets how to display the text inside the TextView when it exceeds the text-view's height.
493 * @param policy The exceed policy. Original is set by default.
495 void SetHeightExceedPolicy( ExceedPolicy policy );
498 * @brief Gets the height exceed policy.
500 * @return The exceed policy.
502 ExceedPolicy GetHeightExceedPolicy() const;
505 * @brief Sets how to justify lines inside the text area.
507 * @param justification The line justification. Left is set by default.
509 void SetLineJustification( LineJustification justification );
512 * @brief Gets the line justification.
514 * @return The line justification.
516 LineJustification GetLineJustification() const;
519 * @brief Sets a fade boundary.
523 * @param[in] fadeBoundary The given fade boundary.
525 void SetFadeBoundary( const FadeBoundary& fadeBoundary );
528 * @brief Retrieves the fade boundary.
532 * @return The fade boundary.
534 const FadeBoundary& GetFadeBoundary() const;
537 * @brief Sets the ellipsize text.
539 * @param[in] ellipsizeText The new text. The string may contain style tags. By default the ellipsize text is '...'
541 void SetEllipsizeText( const std::string& ellipsizeText );
544 * @brief Sets the ellipsize text.
546 * @param[in] ellipsizeText The new text with its style.
548 void SetEllipsizeText( const MarkupProcessor::StyledTextArray& ellipsizeText );
551 * @brief Retrieves the ellipsize text.
553 * @return The ellipsize text.
555 std::string GetEllipsizeText() const;
558 * @brief A mechanism to retrieve layout information from the TextView.
560 * It produces a vector of CharcterLayoutInfo structures which describe the size and position of each character,
561 * two vectors which maps the logical and visual positions of the characters in a bidirectional text, the size
562 * of the whole laid-out text and the scroll offset value.
564 * @see TextLayoutInfo.
566 * @param[out] textLayoutInfo A structure with text layout information.
568 void GetTextLayoutInfo( TextLayoutInfo& textLayoutInfo );
571 * @brief Allows modification of text-actor's position in the depth sort algorithm.
573 * @see Dali::RenderableActor::SetSortModifier()
574 * @param [in] depthOffset the offset to be given to the internal text-actors. Positive values pushing it further back.
576 void SetSortModifier( float depthOffset );
579 * @brief Sets whether text-view renders text using a previously generated snapshot.
581 * Rendering long text using a snapshot may increase performance. The default value is \e true (render using a snapshot).
583 * @param[in] enable Whether text-view is using a snapshot to render text.
585 void SetSnapshotModeEnabled( bool enable );
588 * @brief Retrieves whether text-view is using a snapshot to render text.
590 * @return \e true if text-view is using a snapshot to render text, otherwhise it returns \e false.
592 bool IsSnapshotModeEnabled() const;
595 * @brief Sets whether markup processing should be carried out.
597 * @param[in] enable whether markup processing is carried out or not.
599 void SetMarkupProcessingEnabled( bool enable );
602 * @brief Retrieves whether text-view is processing markup text
604 * @return \e true if text-view markup processing is enabled, otherwhise it returns \e false.
606 bool IsMarkupProcessingEnabled() const;
609 * @brief Enables or disables the text scroll.
611 * When scroll is enabled, snapshot mode will be enabled automatically. Equally, if scroll is disabled
612 * the snapshot mode is restored to the previous value.
614 * @param[in] enable Whether to enable the text scroll.
616 void SetScrollEnabled( bool enable );
619 * @brief Retrieves whether the text scroll is enabled.
621 * @return \e true if the scroll is enabled.
623 bool IsScrollEnabled() const;
626 * @brief Sets a new scroll position.
628 * The new scroll position set could be trimmed if the text doesn't cover the whole text-view.
629 * i.e. If a text-view is 100x100 and a text is 200x100 a scroll position beyond 50x0 will be trimmed to 50x0.
631 * Call IsScrollPositionTrimmed() to know if the last scroll position set has been trimmed.
633 * A signal is emitted. @see ScrolledSignal().
635 * @param[in] position The new scroll position.
637 void SetScrollPosition( const Vector2& position );
640 * @brief Recrieves current scroll position.
642 * @return The scroll position.
644 const Vector2& GetScrollPosition() const;
647 * @brief Whether the last scroll position set was trimmed.
649 * @return \e true if the last scroll position set was trimmed, otherwise \e false.
651 bool IsScrollPositionTrimmed() const;
654 /// @brief Signal types
655 typedef SignalV2< void ( TextView textView, Vector2 scrollDelta ) > ScrolledSignalV2;
658 * @brief Signal emitted when the scroll position changes.
660 * A callback with the following prototype can be connected to this signal.
662 * Callback(TextView textView, Vector2 scrollDelta)
664 * \e textView is the handle of the text-view emitting the signal.
665 * \e scrollDelta is the differente of the current scroll position with the previous one.
666 * @return The signal to connect to
668 ScrolledSignalV2& ScrolledSignal();
670 public: // Not intended for application developers
673 * @brief Creates a handle using the Toolkit::Internal implementation.
675 * @param[in] implementation The Control implementation.
677 TextView( Internal::TextView& implementation );
680 * @brief Allows the creation of this Control from an Internal::CustomActor pointer.
682 * @param[in] internal A pointer to the internal CustomActor.
684 TextView( Dali::Internal::CustomActor* internal );
687 } // namespace Toolkit
694 #endif // __DALI_TOOLKIT_ITEM_VIEW_H__