JUCE/examples/GUI/MDIDemo.h

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

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

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.

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

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

/*******************************************************************************
 The block below describes the properties of this PIP. A PIP is a short snippet
 of code that can be read by the Projucer and used to generate a JUCE project.

 BEGIN_JUCE_PIP_METADATA

 name:             MDIDemo
 version:          1.0.0
 vendor:           JUCE
 website:          http://juce.com
 description:      Displays and edits MDI files.

 dependencies:     juce_core, juce_data_structures, juce_events, juce_graphics,
                   juce_gui_basics, juce_gui_extra
 exporters:        xcode_mac, vs2017, linux_make, androidstudio, xcode_iphone

 type:             Component
 mainClass:        MDIDemo

 useLocalCopy:     1

 END_JUCE_PIP_METADATA

*******************************************************************************/

#pragma once

#include "../Assets/DemoUtilities.h"

//==============================================================================
/** The Note class contains text editor used to display and edit the note's contents and will
    also listen to changes in the text and mark the FileBasedDocument as 'dirty'. This 'dirty'
    flag is used to promt the user to save the note when it is closed.
 */
class Note    : public Component,
                public FileBasedDocument
{
public:
    Note (const String& name, const String& contents)
        : FileBasedDocument (".jnote", "*.jnote",
                             "Browse for note to load",
                             "Choose file to save note to"),
          textValueObject (contents)
    {
        // we need to use an separate Value object as our text source so it doesn't get marked
        // as changed immediately
        setName (name);

        editor.setMultiLine (true);
        editor.setReturnKeyStartsNewLine (true);
        editor.getTextValue().referTo (textValueObject);
        addAndMakeVisible (editor);
        editor.onTextChange = [this] { changed(); };
    }

    void resized() override
    {
        editor.setBounds (getLocalBounds());
    }

    String getDocumentTitle() override
    {
        return getName();
    }

    Result loadDocument (const File& file) override
    {
        editor.setText (file.loadFileAsString());
        return Result::ok();
    }

    Result saveDocument (const File& file) override
    {
        // attempt to save the contents into the given file
        FileOutputStream os (file);

        if (os.openedOk())
            os.writeText (editor.getText(), false, false);

        return Result::ok();
    }

    File getLastDocumentOpened() override
    {
        // not interested in this for now
        return {};
    }

    void setLastDocumentOpened (const File& /*file*/) override
    {
        // not interested in this for now
    }

   #if JUCE_MODAL_LOOPS_PERMITTED
    File getSuggestedSaveAsFile (const File&) override
    {
        return File::getSpecialLocation (File::userDesktopDirectory).getChildFile (getName()).withFileExtension ("jnote");
    }
   #endif

private:
    Value textValueObject;
    TextEditor editor;

    void lookAndFeelChanged() override
    {
        editor.applyFontToAllText (editor.getFont());
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Note)
};


//==============================================================================
/** Simple MultiDocumentPanel that just tries to save our notes when they are closed.
 */
class DemoMultiDocumentPanel    : public MultiDocumentPanel
{
public:
    DemoMultiDocumentPanel() {}

    ~DemoMultiDocumentPanel()
    {
        closeAllDocuments (true);
    }

    bool tryToCloseDocument (Component* component) override
    {
       #if JUCE_MODAL_LOOPS_PERMITTED
        if (auto* note = dynamic_cast<Note*> (component))
            return note->saveIfNeededAndUserAgrees() != FileBasedDocument::failedToWriteToFile;
       #else
        ignoreUnused (component);
       #endif

        return true;
    }

private:
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (DemoMultiDocumentPanel)
};

//==============================================================================
/** Simple multi-document panel that manages a number of notes that you can store to files.
    By default this will look for notes saved to the desktop and load them up.
 */
class MDIDemo   : public Component,
                  public FileDragAndDropTarget
{
public:
    MDIDemo()
    {
        setOpaque (true);

        showInTabsButton.setToggleState (false, dontSendNotification);
        showInTabsButton.onClick = [this] { updateLayoutMode(); };
        addAndMakeVisible (showInTabsButton);

        addNoteButton.onClick = [this] { addNote ("Note " + String (multiDocumentPanel.getNumDocuments() + 1), "Hello World!"); };
        addAndMakeVisible (addNoteButton);

        addAndMakeVisible (multiDocumentPanel);
        multiDocumentPanel.setBackgroundColour (Colours::transparentBlack);

        updateLayoutMode();
        addNote ("Notes Demo", "You can drag-and-drop text files onto this page to open them as notes..");
        addExistingNotes();

        setSize (500, 500);
    }

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

    void resized() override
    {
        auto area = getLocalBounds();

        auto buttonArea = area.removeFromTop (28).reduced (2);
        addNoteButton   .setBounds (buttonArea.removeFromRight (150));
        showInTabsButton.setBounds (buttonArea);

        multiDocumentPanel.setBounds (area);
    }

    bool isInterestedInFileDrag (const StringArray&) override
    {
        return true;
    }

    void filesDropped (const StringArray& filenames, int /*x*/, int /*y*/) override
    {
        Array<File> files;

        for (auto& f : filenames)
            files.add ({ f });

        createNotesForFiles (files);
    }

    void createNotesForFiles (const Array<File>& files)
    {
        for (auto& file : files)
        {
            auto content = file.loadFileAsString();

            if (content.length() > 20000)
                content = "Too long!";

            addNote (file.getFileName(), content);
        }
    }

private:
    ToggleButton showInTabsButton  { "Show with tabs" };
    TextButton addNoteButton       { "Create a new note" };

    DemoMultiDocumentPanel multiDocumentPanel;

    void updateLayoutMode()
    {
        multiDocumentPanel.setLayoutMode (showInTabsButton.getToggleState() ? MultiDocumentPanel::MaximisedWindowsWithTabs
                                                                            : MultiDocumentPanel::FloatingWindows);
    }

    void addNote (const String& name, const String& content)
    {
        auto* newNote = new Note (name, content);
        newNote->setSize (200, 200);

        multiDocumentPanel.addDocument (newNote, Colours::lightblue.withAlpha (0.6f), true);
    }

    void addExistingNotes()
    {
        Array<File> files;
        File::getSpecialLocation (File::userDesktopDirectory).findChildFiles (files, File::findFiles, false, "*.jnote");
        createNotesForFiles (files);
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MDIDemo)
};