Carla/source/modules/juce_gui_basics/windows/juce_TooltipWindow.h

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

   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3

   Details of these licenses can be found at: www.gnu.org/licenses

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

   ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.

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

#ifndef JUCE_TOOLTIPWINDOW_H_INCLUDED
#define JUCE_TOOLTIPWINDOW_H_INCLUDED


//==============================================================================
/**
    A window that displays a pop-up tooltip when the mouse hovers over another component.

    To enable tooltips in your app, just create a single instance of a TooltipWindow
    object. Note that if you instantiate more than one instance of this class, you'll
    end up with multiple tooltips being shown! This is a common problem when compiling
    audio plug-ins with JUCE: depending on the way you instantiate TooltipWindow,
    you may end up with a TooltipWindow for each plug-in instance. To avoid this use a
    SharedResourcePointer to instantiate the TooltipWindow only once.

    The TooltipWindow object will then stay invisible, waiting until the mouse
    hovers for the specified length of time - it will then see if it's currently
    over a component which implements the TooltipClient interface, and if so,
    it will make itself visible to show the tooltip in the appropriate place.

    @see TooltipClient, SettableTooltipClient, SharedResourcePointer
*/
class JUCE_API  TooltipWindow  : public Component,
                                 private Timer
{
public:
    //==============================================================================
    /** Creates a tooltip window.

        Make sure your app only creates one instance of this class, otherwise you'll
        get multiple overlaid tooltips appearing. The window will initially be invisible
        and will make itself visible when it needs to display a tip.

        To change the style of tooltips, see the LookAndFeel class for its tooltip
        methods.

        @param parentComponent  if set to 0, the TooltipWindow will appear on the desktop,
                                otherwise the tooltip will be added to the given parent
                                component.
        @param millisecondsBeforeTipAppears     the time for which the mouse has to stay still
                                                before a tooltip will be shown

        @see TooltipClient, LookAndFeel::drawTooltip, LookAndFeel::getTooltipBounds
    */
    explicit TooltipWindow (Component* parentComponent = nullptr,
                            int millisecondsBeforeTipAppears = 700);

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

    //==============================================================================
    /** Changes the time before the tip appears.
        This lets you change the value that was set in the constructor.
    */
    void setMillisecondsBeforeTipAppears (int newTimeMs = 700) noexcept;

    /** Can be called to manually force a tip to be shown at a particular location. */
    void displayTip (Point<int> screenPosition, const String& text);

    /** Can be called to manually hide the tip if it's showing. */
    void hideTip();

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

        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      = 0x1001b00,    /**< The colour to fill the background with. */
        textColourId            = 0x1001c00,    /**< The colour to use for the text. */
        outlineColourId         = 0x1001c10     /**< The colour to use to draw an outline around the tooltip. */
    };

    //==============================================================================
    /** This abstract base class is implemented by LookAndFeel classes to provide
        window drawing functionality.
    */
    struct JUCE_API  LookAndFeelMethods
    {
        virtual ~LookAndFeelMethods() {}

        /** returns the bounds for a tooltip at the given screen coordinate, constrained within the given desktop area. */
        virtual Rectangle<int> getTooltipBounds (const String& tipText, Point<int> screenPos, Rectangle<int> parentArea) = 0;
        virtual void drawTooltip (Graphics&, const String& text, int width, int height) = 0;

       #if JUCE_CATCH_DEPRECATED_CODE_MISUSE
        // This method has been replaced by getTooltipBounds()
        virtual int getTooltipSize (const String&, int&, int&) { return 0; }
       #endif
    };

private:
    //==============================================================================
    Point<float> lastMousePos;
    Component* lastComponentUnderMouse;
    String tipShowing, lastTipUnderMouse;
    int millisecondsBeforeTipAppears;
    int mouseClicks, mouseWheelMoves;
    unsigned int lastCompChangeTime, lastHideTime;
    bool reentrant;

    void paint (Graphics&) override;
    void mouseEnter (const MouseEvent&) override;
    void timerCallback() override;
    void updatePosition (const String&, Point<int>, Rectangle<int>);

    static String getTipFor (Component*);

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (TooltipWindow)
};


#endif   // JUCE_TOOLTIPWINDOW_H_INCLUDED