axmol/core/ui/UITextField.h

/****************************************************************************
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

https://axys1.github.io/

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#ifndef __UITEXTFIELD_H__
#define __UITEXTFIELD_H__

#include "ui/UIWidget.h"
#include "2d/CCTextFieldTTF.h"
#include "ui/GUIExport.h"

NS_AX_BEGIN
/**
 * @addtogroup ui
 * @{
 */

namespace ui
{

/**
 * @brief A helper class which inherit from @see `TextFieldTTF` and implements the @see `TextFieldDelegate` protocol.
 * It is mainly be used internally by @see `UITextField` class.
 * @js NA
 * @lua NA
 */
class AX_GUI_DLL UICCTextField : public TextFieldTTF, public TextFieldDelegate
{
public:
    /**
     * @brief Create an empty UICCTextField.
     *
     * @return A UICCTextField instance.
     */
    static UICCTextField* create();

    /**
     * Default constructor
     */
    UICCTextField();

    /**
     * Default destructor
     */
    ~UICCTextField();

    virtual void onEnter() override;

    /**
     * Create a UICCTextField instance with a placeholder, a fontName and a fontSize.
     *@param placeholder Placeholder in string.
     *@param fontName Font name in string.
     *@param fontSize Font size in float.
     *@return A UICCTextField instance.
     */
    static UICCTextField* create(std::string_view placeholder, std::string_view fontName, float fontSize);

    // override functions
    virtual bool onTextFieldAttachWithIME(TextFieldTTF* pSender) override;
    virtual bool onTextFieldDetachWithIME(TextFieldTTF* pSender) override;
    virtual bool onTextFieldInsertText(TextFieldTTF* pSender, const char* text, size_t nLen) override;
    virtual bool onTextFieldDeleteBackward(TextFieldTTF* pSender, const char* delText, size_t nLen) override;
    void insertText(const char* text, size_t len) override;

    /**
     * Open up the IME.
     */
    void openIME();

    /**
     * Close the IME.
     */
    void closeIME();

    /**
     * Toggle enable max length limitation.
     *@param enable True to enable max length, false otherwise.
     */
    void setMaxLengthEnabled(bool enable);

    /**
     * Query max length enable state.
     *@return Whether max length is enabled or not.
     */
    bool isMaxLengthEnabled() const;

    /**
     * Set maximize length.
     *@param length  The maximize length in integer.
     */
    void setMaxLength(int length);

    /**
     * Get maximize length.
     *@return Maximize length.
     */
    int getMaxLength() const;

    /**
     * Return the total inputed characters.
     *@return Total inputed character count.
     */
    std::size_t getCharCount() const;

    /**
     * @brief Toggle password input mode.
     *
     * @param enable True if enable password input, false otherwise.
     */
    void setPasswordEnabled(bool enable);

    /**
     * @brief Query whether password input mode is enabled or not.
     *
     * @return True if password input is enabled, false otherwise.
     */
    bool isPasswordEnabled() const;

    /**
     * @brief Change password style text.
     *
     * @param styleText The styleText for password mask, the default value is "*".
     */
    void setPasswordStyleText(std::string_view styleText);

    /**
     * @brief Set the password text content.
     *
     * @param text The content of password.
     */
    void setPasswordText(std::string_view text);

    /**
     * @brief Toggle attach with IME.
     *
     * @param attach True if attach with IME, false otherwise.
     */
    void setAttachWithIME(bool attach);

    /**
     * @brief Query whether the IME is attached or not.
     *
     * @return True if IME is attached, false otherwise.
     */
    bool getAttachWithIME() const;

    /**
     * @brief Toggle detach with IME.
     *
     * @param detach True if detach with IME, false otherwise.
     */
    void setDetachWithIME(bool detach);

    /**
     * @brief Query whether IME is detached or not.
     *
     * @return True if IME is detached, false otherwise.
     */
    bool getDetachWithIME() const;

    /**
     * @brief Toggle enable text insert.
     *
     * @param insert True if enable insert text, false otherwise.
     */
    void setInsertText(bool insert);

    /**
     * @brief Query whether insert text is enabled or not.
     *
     * @return True if insert text is enabled, false otherwise.
     */
    bool getInsertText() const;

    /**
     * @brief Toggle enable delete backward.
     *
     * @param deleteBackward True if enable delete backward, false otherwise.
     */
    void setDeleteBackward(bool deleteBackward);

    /**
     * @brief Query whether delete backward is enabled   or not.
     *
     * @return True if delete backward is enabled, false otherwise.
     */
    bool getDeleteBackward() const;

protected:
    bool _maxLengthEnabled;
    int _maxLength;
    bool _attachWithIME;
    bool _detachWithIME;
    bool _insertText;
    bool _deleteBackward;
};

/**
 * @brief A widget which allows users to input text.
 * The rendering of the input text are based on @see `TextFieldTTF'.
 * If you want to use system control behavior, please use @see `EditBox` instead.
 * @js NA
 * @lua NA
 */
class AX_GUI_DLL TextField : public Widget
{

    DECLARE_CLASS_GUI_INFO

public:
    /**
     * TextField event type.
     */
    enum class EventType
    {
        ATTACH_WITH_IME,
        DETACH_WITH_IME,
        INSERT_TEXT,
        DELETE_BACKWARD,
    };
    /**
     * A callback which would be called when a TextField event happens.
     */
    typedef std::function<void(Ref*, EventType)> ccTextFieldCallback;

    /**
     * @brief Default constructor.
     *
     */
    TextField();

    /**
     * @brief Default destructor.
     */
    virtual ~TextField();

    /**
     * @brief Create an empty TextField.
     *
     * @return A TextField instance.
     */
    static TextField* create();

    /**
     * @brief Create a TextField with a placeholder, a font name and a font size.
     *
     * @param placeholder The placeholder string.
     * @param fontName The font name.
     * @param fontSize The font size.
     * @return A TextField instance.
     */
    static TextField* create(std::string_view placeholder, std::string_view fontName, int fontSize);

    /**
     * @brief Set the touch size
     * The touch size is used for @see `hitTest`.
     * @param size A delimitation zone.
     */
    void setTouchSize(const Vec2& size);

    /**
     * @brief Get current touch size of TextField.
     *
     * @return The TextField's touch size.
     */
    Vec2 getTouchSize() const;

    /**
     * @brief Toggle enable touch area.
     *
     * @param enable True if enable touch area, false otherwise.
     */
    void setTouchAreaEnabled(bool enable);

    virtual bool hitTest(const Vec2& pt, const Camera* camera, Vec3* p) const override;

    /**
     * @brief Set placeholder of TextField.
     *
     * @param value The string value of placeholder.
     */
    void setPlaceHolder(std::string_view value);

    /**
     * @brief Get the placeholder of TextField.
     *
     * @return A placeholder string.
     */
    std::string_view getPlaceHolder() const;

    /**
     * @brief Query the placeholder string color.
     *
     * @return The color of placeholder.
     */
    const Color4B& getPlaceHolderColor() const;

    /**
     * @brief Change the placeholder color.
     *
     * @param color A color value in `Color3B`.
     */
    void setPlaceHolderColor(const Color3B& color);

    /**
     * @brief Change the placeholder color.
     *
     * @param color A color value in `Color4B`.
     */
    void setPlaceHolderColor(const Color4B& color);

    /**
     * @brief Query the text string color.
     *
     * @return The color of the text.
     */
    const Color4B& getTextColor() const;

    /**
     * @brief Change the text color.
     *
     * @param textColor The color value in `Color4B`.
     */
    void setTextColor(const Color4B& textColor);

    /**
     * @brief Change font size of TextField.
     *
     * @param size The integer font size.
     */
    void setFontSize(int size);

    /**
     * @brief Query the font size.
     *
     * @return The integer font size.
     */
    int getFontSize() const;

    /**
     * @brief Change the font name of TextField.
     *
     * @param name The font name string.
     */
    void setFontName(std::string_view name);

    /**
     * @brief Query the TextField's font name.
     *
     * @return The font name string.
     */
    std::string_view getFontName() const;

    /**
     * @brief Detach the IME.
     */
    virtual void didNotSelectSelf();

    /**
     *Change content of TextField.
     *@param text A string content.
     */
    void setString(std::string_view text);

    /**
     *Query the content of TextField.
     *@return The string value of TextField.
     */
    std::string_view getString() const;

    virtual bool onTouchBegan(Touch* touch, Event* unusedEvent) override;

    /**
     * @brief Toggle maximize length enable
     *
     * @param enable True if enable maximize length, false otherwise.
     */
    void setMaxLengthEnabled(bool enable);

    /**
     * @brief Query whether max length is enabled or not.
     *
     * @return True if maximize length is enabled, false otherwise.
     */
    bool isMaxLengthEnabled() const;

    /**
     * @brief Change maximize input length limitation.
     *
     * @param length A character count in integer.
     */
    void setMaxLength(int length);

    /**
     * @brief Query maximize input length of TextField.
     *
     * @return The integer value of maximize input length.
     */
    int getMaxLength() const;

    /**
     * @brief Query the input string length.
     *
     * @return A integer length value.
     */
    int getStringLength() const;

    /**
     * @brief Toggle enable password input mode.
     *
     * @param enable True if enable password input mode, false otherwise.
     */
    void setPasswordEnabled(bool enable);

    /**
     * @brief Query whether password is enabled or not.
     *
     * @return True if password is enabled, false otherwise.
     */
    bool isPasswordEnabled() const;

    /**
     * @brief Change password style text.
     *
     * @param styleText The styleText for password mask, the default value is "*".
     */
    void setPasswordStyleText(std::string_view styleText);
    /**
     * @brief Query the password style text.
     *
     * @return A password style text.
     */
    std::string_view getPasswordStyleText() const;

    virtual void update(float dt) override;

    /**
     * @brief Query whether the IME is attached or not.
     *
     * @return True if IME is attached, false otherwise.
     */
    bool getAttachWithIME() const;

    /**
     * @brief Toggle attach with IME.
     *
     * @param attach True if attach with IME, false otherwise.
     */
    void setAttachWithIME(bool attach);

    /**
     * @brief Query whether IME is detached or not.
     *
     * @return True if IME is detached, false otherwise.
     */
    bool getDetachWithIME() const;

    /**
     * @brief Toggle detach with IME.
     *
     * @param detach True if detach with IME, false otherwise.
     */
    void setDetachWithIME(bool detach);

    /**
     * @brief Whether it is ready to get the inserted text or not.
     *
     * @return True if the insert text is ready, false otherwise.
     */
    bool getInsertText() const;

    /**
     * @brief Toggle enable insert text mode
     *
     * @param insertText True if enable insert text, false otherwise.
     */
    void setInsertText(bool insertText);

    /**
     * @brief Whether it is ready to delete backward in TextField.
     *
     * @return True is the delete backward is enabled, false otherwise.
     */
    bool getDeleteBackward() const;

    /**
     * @brief Toggle enable delete backward mode.
     *
     * @param deleteBackward True is delete backward is enabled, false otherwise.
     */
    void setDeleteBackward(bool deleteBackward);

    /**
     * Add a event listener to TextField, when some predefined event happens, the callback will be called.
     *@param callback A callback function with type of `ccTextFieldCallback`.
     */
    void addEventListener(const ccTextFieldCallback& callback);

    /**
     * Returns the "class name" of widget.
     */
    virtual std::string getDescription() const override;

    /**
     * @brief Get the renderer size in auto mode.
     *
     * @return A delimitation zone.
     */
    virtual Vec2 getAutoRenderSize();
    // override functions.
    virtual Vec2 getVirtualRendererSize() const override;
    virtual Node* getVirtualRenderer() override;
    virtual void onEnter() override;

    /**
     * @brief Attach the IME for inputing.
     *
     */
    void attachWithIME();

    /**
     * @brief Detach the IME from inputing.
     *
     */
    void detachWithIME();

    /**
     * @brief Change the text area size.
     *
     * @param size A delimitation zone.
     */
    void setTextAreaSize(const Vec2& size);

    /**
     * @brief Change horizontal text alignment.
     *
     * @param alignment A alignment arguments in @see `TextHAlignment`.
     */
    void setTextHorizontalAlignment(TextHAlignment alignment);

    /**
     * @brief Inquire the horizontal alignment
     *
     * @return The horizontal alignment
     */
    TextHAlignment getTextHorizontalAlignment() const;

    /**
     * @brief Change the vertical text alignment.
     *
     * @param alignment A alignment arguments in @see `TextVAlignment`.
     */
    void setTextVerticalAlignment(TextVAlignment alignment);

    /**
     * @brief Inquire the horizontal alignment
     *
     * @return The horizontal alignment
     */
    TextVAlignment getTextVerticalAlignment() const;

    /**
     * Set enable cursor use.
     * @js NA
     */
    void setCursorEnabled(bool enabled);

    /**
     * Set char showing cursor.
     * @js NA
     */
    void setCursorChar(char cursor);

    /**
     * Set cursor position, if enabled
     * @js NA
     */
    void setCursorPosition(std::size_t cursorPosition);

    /**
     * Set cursor position to hit letter, if enabled
     * @js NA
     */
    void setCursorFromPoint(const Vec2& point, const Camera* camera);

    virtual bool init() override;

protected:
    virtual void initRenderer() override;
    void attachWithIMEEvent();
    void detachWithIMEEvent();
    void insertTextEvent();
    void deleteBackwardEvent();
    virtual void onSizeChanged() override;

    void textfieldRendererScaleChangedWithSize();

    virtual Widget* createCloneInstance() override;
    virtual void copySpecialProperties(Widget* model) override;
    virtual void adaptRenderers() override;

protected:
    UICCTextField* _textFieldRenderer;

    float _touchWidth;
    float _touchHeight;
    bool _useTouchArea;

    Ref* _textFieldEventListener;
    ccTextFieldCallback _eventCallback;

    bool _textFieldRendererAdaptDirty;

protected:
    enum class FontType
    {
        SYSTEM,
        TTF,
        BMFONT
    };

    std::string _fontName;
    int _fontSize;
    FontType _fontType;
};

}  // namespace ui

// end of ui group
/// @}
NS_AX_END

#endif /* defined(__TextField__) */