JUCE/examples/Demo/Source/Demos/WindowsDemo.cpp

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

   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.

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

#include "../JuceDemoHeader.h"

//==============================================================================
/** Just a simple window that deletes itself when closed. */
class BasicWindow   : public DocumentWindow
{
public:
    BasicWindow (const String& name, Colour backgroundColour, int buttonsNeeded)
        : DocumentWindow (name, backgroundColour, buttonsNeeded)
    {
    }

    void closeButtonPressed()
    {
        delete this;
    }

private:
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BasicWindow)
};

//==============================================================================
/** This window contains a ColourSelector which can be used to change the window's colour. */
class ColourSelectorWindow   : public DocumentWindow,
                               private ChangeListener
{
public:
    ColourSelectorWindow (const String& name, Colour backgroundColour, int buttonsNeeded)
        : DocumentWindow (name, backgroundColour, buttonsNeeded),
          selector (ColourSelector::showColourAtTop
                     | ColourSelector::showSliders
                     | ColourSelector::showColourspace)
    {
        selector.setCurrentColour (backgroundColour);
        selector.setColour (ColourSelector::backgroundColourId, Colours::transparentWhite);
        selector.addChangeListener (this);
        setContentOwned (&selector, false);
    }

    ~ColourSelectorWindow()
    {
        selector.removeChangeListener (this);
    }

    void closeButtonPressed()
    {
        delete this;
    }

private:
    ColourSelector selector;

    void changeListenerCallback (ChangeBroadcaster* source)
    {
        if (source == &selector)
            setBackgroundColour (selector.getCurrentColour());
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ColourSelectorWindow)
};

//==============================================================================
class BouncingBallComponent : public Component,
                              public Timer
{
public:
    BouncingBallComponent()
    {
        setInterceptsMouseClicks (false, false);

        Random random;

        const float size = 10.0f + random.nextInt (30);

        ballBounds.setBounds (random.nextFloat() * 100.0f,
                              random.nextFloat() * 100.0f,
                              size, size);

        direction.x = random.nextFloat() * 8.0f - 4.0f;
        direction.y = random.nextFloat() * 8.0f - 4.0f;

        colour = Colour ((juce::uint32) random.nextInt())
                    .withAlpha (0.5f)
                    .withBrightness (0.7f);

        startTimer (60);
    }

    void paint (Graphics& g) override
    {
        g.setColour (colour);
        g.fillEllipse (ballBounds - getPosition().toFloat());
    }

    void timerCallback() override
    {
        ballBounds += direction;

        if (ballBounds.getX() < 0)                      direction.x =  std::abs (direction.x);
        if (ballBounds.getY() < 0)                      direction.y =  std::abs (direction.y);
        if (ballBounds.getRight() > getParentWidth())   direction.x = -std::abs (direction.x);
        if (ballBounds.getBottom() > getParentHeight()) direction.y = -std::abs (direction.y);

        setBounds (ballBounds.getSmallestIntegerContainer());
    }

private:
    Colour colour;
    Rectangle<float> ballBounds;
    Point<float> direction;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BouncingBallComponent)
};

//==============================================================================
class BouncingBallsContainer : public Component
{
public:
    BouncingBallsContainer (int numBalls)
    {
        for (int i = 0; i < numBalls; ++i)
        {
            BouncingBallComponent* newBall = new BouncingBallComponent();
            balls.add (newBall);
            addAndMakeVisible (newBall);
        }
    }

    void mouseDown (const MouseEvent& e) override
    {
        dragger.startDraggingComponent (this, e);
    }

    void mouseDrag (const MouseEvent& e) override
    {
        // as there's no titlebar we have to manage the dragging ourselves
        dragger.dragComponent (this, e, 0);
    }

    void paint (Graphics& g) override
    {
        if (isOpaque())
            g.fillAll (Colours::white);
        else
            g.fillAll (Colours::blue.withAlpha (0.2f));

        g.setFont (16.0f);
        g.setColour (Colours::black);
        g.drawFittedText ("This window has no titlebar and a transparent background.",
                          getLocalBounds().reduced (8, 0),
                          Justification::centred, 5);

        g.drawRect (getLocalBounds());
    }

private:
    ComponentDragger dragger;
    OwnedArray<BouncingBallComponent> balls;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BouncingBallsContainer)
};

//==============================================================================
class WindowsDemo   : public Component,
                      private Button::Listener
{
public:
    enum Windows
    {
        dialog,
        document,
        alert,
        numWindows
    };

    WindowsDemo()
    {
        setOpaque (true);

        showWindowsButton.setButtonText ("Show Windows");
        addAndMakeVisible (showWindowsButton);
        showWindowsButton.addListener (this);

        closeWindowsButton.setButtonText ("Close Windows");
        addAndMakeVisible (closeWindowsButton);
        closeWindowsButton.addListener (this);
    }

    ~WindowsDemo()
    {
        if (dialogWindow != nullptr)
        {
            dialogWindow->exitModalState (0);

            // we are shutting down: can't wait for the message manager
            // to eventually delete this
            delete dialogWindow;
        }

        closeAllWindows();

        closeWindowsButton.removeListener (this);
        showWindowsButton.removeListener (this);
    }

    void paint (Graphics& g) override
    {
        g.fillAll (getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour::windowBackground,
                                           Colours::grey));
    }

    void resized() override
    {
        const Rectangle<int> buttonSize (0, 0, 108, 28);
        Rectangle<int> area ((getWidth() / 2) - (buttonSize.getWidth() / 2),
                             (getHeight() / 2) - buttonSize.getHeight(),
                             buttonSize.getWidth(), buttonSize.getHeight());
        showWindowsButton.setBounds (area.reduced (2));
        closeWindowsButton.setBounds (area.translated (0, buttonSize.getHeight()).reduced (2));
    }

private:
    // Because in this demo the windows delete themselves, we'll use the
    // Component::SafePointer class to point to them, which automatically becomes
    // null when the component that it points to is deleted.
    Array< Component::SafePointer<Component> > windows;
    TextButton showWindowsButton, closeWindowsButton;
    SafePointer<DialogWindow> dialogWindow;

    void showAllWindows()
    {
        closeAllWindows();

        showDocumentWindow (false);
        showDocumentWindow (true);
        showTransparentWindow();
        showDialogWindow();
    }

    void closeAllWindows()
    {
        for (int i = 0; i < windows.size(); ++i)
            windows.getReference(i).deleteAndZero();

        windows.clear();
    }

    void showDialogWindow()
    {
        String m;

        m << "Dialog Windows can be used to quickly show a component, usually blocking mouse input to other windows." << newLine
          << newLine
          << "They can also be quickly closed with the escape key, try it now.";

        DialogWindow::LaunchOptions options;
        Label* label = new Label();
        label->setText (m, dontSendNotification);
        label->setColour (Label::textColourId, Colours::whitesmoke);
        options.content.setOwned (label);

        Rectangle<int> area (0, 0, 300, 200);

        options.content->setSize (area.getWidth(), area.getHeight());

        options.dialogTitle                   = "Dialog Window";
        options.dialogBackgroundColour        = Colour (0xff0e345a);
        options.escapeKeyTriggersCloseButton  = true;
        options.useNativeTitleBar             = false;
        options.resizable                     = true;

        dialogWindow = options.launchAsync();

        if (dialogWindow != nullptr)
            dialogWindow->centreWithSize (300, 200);
    }

    void showDocumentWindow (bool native)
    {
        DocumentWindow* dw = new ColourSelectorWindow ("Document Window", getRandomBrightColour(), DocumentWindow::allButtons);
        windows.add (dw);

        Rectangle<int> area (0, 0, 300, 400);

        RectanglePlacement placement ((native ? RectanglePlacement::xLeft
                                              : RectanglePlacement::xRight)
                                       | RectanglePlacement::yTop
                                       | RectanglePlacement::doNotResize);

        Rectangle<int> result (placement.appliedTo (area, Desktop::getInstance().getDisplays()
                                                            .getMainDisplay().userArea.reduced (20)));
        dw->setBounds (result);

        dw->setResizable (true, ! native);
        dw->setUsingNativeTitleBar (native);
        dw->setVisible (true);
    }

    void showTransparentWindow()
    {
        BouncingBallsContainer* balls = new BouncingBallsContainer (3);
        balls->addToDesktop (ComponentPeer::windowIsTemporary);
        windows.add (balls);

        Rectangle<int> area (0, 0, 200, 200);

        RectanglePlacement placement (RectanglePlacement::xLeft
                                       | RectanglePlacement::yBottom
                                       | RectanglePlacement::doNotResize);

        Rectangle<int> result (placement.appliedTo (area, Desktop::getInstance().getDisplays()
                                                            .getMainDisplay().userArea.reduced (20)));
        balls->setBounds (result);

        balls->setVisible (true);
    }

    void buttonClicked (Button* button) override
    {
        if (button == &showWindowsButton)
            showAllWindows();
        else if (button == &closeWindowsButton)
            closeAllWindows();
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WindowsDemo)
};

// This static object will register this demo type in a global list of demos..
static JuceDemoType<WindowsDemo> demo ("10 Components: Windows");