JUCE/modules/juce_gui_basics/properties/juce_TextPropertyComponent.h

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 5 End-User License
   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
   27th April 2017).

   End User License Agreement: www.juce.com/juce-5-licence
   Privacy Policy: www.juce.com/juce-5-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

#pragma once


//==============================================================================
/**
    A PropertyComponent that shows its value as editable text.

    @see PropertyComponent
*/
class JUCE_API  TextPropertyComponent  : public PropertyComponent
{
protected:
    //==============================================================================
    /** Creates a text property component.

        @param propertyName  The name of the property
        @param maxNumChars   If not zero, then this specifies the maximum allowable length of
                             the string. If zero, then the string will have no length limit.
        @param isMultiLine   isMultiLine sets whether the text editor allows carriage returns.

        @see TextEditor
    */
    TextPropertyComponent (const String& propertyName,
                           int maxNumChars,
                           bool isMultiLine);

public:
    /** Creates a text property component.

        @param valueToControl The Value that is controlled by the TextPropertyCOmponent
        @param propertyName   The name of the property
        @param maxNumChars    If not zero, then this specifies the maximum allowable length of
                              the string. If zero, then the string will have no length limit.
        @param isMultiLine    isMultiLine sets whether the text editor allows carriage returns.

        @see TextEditor
    */
    TextPropertyComponent (const Value& valueToControl,
                           const String& propertyName,
                           int maxNumChars,
                           bool isMultiLine);

    /** Destructor. */
    ~TextPropertyComponent();

    //==============================================================================
    /** Called when the user edits the text.

        Your subclass must use this callback to change the value of whatever item
        this property component represents.
    */
    virtual void setText (const String& newText);

    /** Returns the text that should be shown in the text editor. */
    virtual String getText() const;

    /** Returns the text that should be shown in the text editor as a Value object. */
    Value& getValue() const;

    //==============================================================================
    /** A set of colour IDs to use to change the colour of various aspects of the component.

        These constants can be used either via the Component::setColour(), or LookAndFeel::setColour()
        methods.

        @see Component::setColour, Component::findColour, LookAndFeel::setColour, LookAndFeel::findColour
    */
    enum ColourIds
    {
        backgroundColourId          = 0x100e401,    /**< The colour to fill the background of the text area. */
        textColourId                = 0x100e402,    /**< The colour to use for the editable text. */
        outlineColourId             = 0x100e403,    /**< The colour to use to draw an outline around the text area. */
    };

    void colourChanged() override;

    //==============================================================================
    class JUCE_API Listener
    {
    public:
        /** Destructor. */
        virtual ~Listener() {}

        /** Called when text has finished being entered (i.e. not per keypress) has changed. */
        virtual void textPropertyComponentChanged (TextPropertyComponent*) = 0;
    };

    /** Registers a listener to receive events when this button's state changes.
        If the listener is already registered, this will not register it again.
        @see removeListener
    */
    void addListener (Listener* newListener);

    /** Removes a previously-registered button listener
        @see addListener
    */
    void removeListener (Listener* listener);

    //==============================================================================
    /** @internal */
    void refresh() override;
    /** @internal */
    virtual void textWasEdited();

private:
    class LabelComp;
    friend class LabelComp;

    ScopedPointer<LabelComp> textEditor;
    ListenerList<Listener> listenerList;

    void callListeners();
    void createEditor (int maxNumChars, bool isMultiLine);

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (TextPropertyComponent)
};

#ifndef DOXYGEN
 /** This typedef is just for compatibility with old code and VC6 - newer code should use TextPropertyComponent::Listener instead. */
 typedef TextPropertyComponent::Listener TextPropertyComponentListener;
#endif