JUCE/modules/juce_gui_basics/filebrowser/juce_FilenameComponent.h

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

   This file is part of the JUCE library.
   Copyright (c) 2013 - Raw Material Software 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_FILENAMECOMPONENT_JUCEHEADER__
#define __JUCE_FILENAMECOMPONENT_JUCEHEADER__

#include "../widgets/juce_ComboBox.h"
#include "../buttons/juce_TextButton.h"
#include "../mouse/juce_FileDragAndDropTarget.h"
class FilenameComponent;


//==============================================================================
/**
    Listens for events happening to a FilenameComponent.

    Use FilenameComponent::addListener() and FilenameComponent::removeListener() to
    register one of these objects for event callbacks when the filename is changed.

    @see FilenameComponent
*/
class JUCE_API  FilenameComponentListener
{
public:
    /** Destructor. */
    virtual ~FilenameComponentListener() {}

    /** This method is called after the FilenameComponent's file has been changed. */
    virtual void filenameComponentChanged (FilenameComponent* fileComponentThatHasChanged) = 0;
};


//==============================================================================
/**
    Shows a filename as an editable text box, with a 'browse' button and a
    drop-down list for recently selected files.

    A handy component for dialogue boxes where you want the user to be able to
    select a file or directory.

    Attach an FilenameComponentListener using the addListener() method, and it will
    get called each time the user changes the filename, either by browsing for a file
    and clicking 'ok', or by typing a new filename into the box and pressing return.

    @see FileChooser, ComboBox
*/
class JUCE_API  FilenameComponent  : public Component,
                                     public SettableTooltipClient,
                                     public FileDragAndDropTarget,
                                     private AsyncUpdater,
                                     private ButtonListener,  // (can't use Button::Listener due to idiotic VC2005 bug)
                                     private ComboBoxListener
{
public:
    //==============================================================================
    /** Creates a FilenameComponent.

        @param name             the name for this component.
        @param currentFile      the file to initially show in the box
        @param canEditFilename  if true, the user can manually edit the filename; if false,
                                they can only change it by browsing for a new file
        @param isDirectory      if true, the file will be treated as a directory, and
                                an appropriate directory browser used
        @param isForSaving      if true, the file browser will allow non-existent files to
                                be picked, as the file is assumed to be used for saving rather
                                than loading
        @param fileBrowserWildcard  a wildcard pattern to use in the file browser - e.g. "*.txt;*.foo".
                                If an empty string is passed in, then the pattern is assumed to be "*"
        @param enforcedSuffix   if this is non-empty, it is treated as a suffix that will be added
                                to any filenames that are entered or chosen
        @param textWhenNothingSelected  the message to display in the box before any filename is entered. (This
                                will only appear if the initial file isn't valid)
    */
    FilenameComponent (const String& name,
                       const File& currentFile,
                       bool canEditFilename,
                       bool isDirectory,
                       bool isForSaving,
                       const String& fileBrowserWildcard,
                       const String& enforcedSuffix,
                       const String& textWhenNothingSelected);

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

    //==============================================================================
    /** Returns the currently displayed filename. */
    File getCurrentFile() const;

    /** Changes the current filename.

        @param newFile                the new filename to use
        @param addToRecentlyUsedList  if true, the filename will also be added to the
                                      drop-down list of recent files.
        @param notification           whether to send a notification of the change to listeners
    */
    void setCurrentFile (File newFile,
                         bool addToRecentlyUsedList,
                         NotificationType notification = sendNotificationAsync);

    /** Changes whether the use can type into the filename box.
    */
    void setFilenameIsEditable (bool shouldBeEditable);

    /** Sets a file or directory to be the default starting point for the browser to show.

        This is only used if the current file hasn't been set.
    */
    void setDefaultBrowseTarget (const File& newDefaultDirectory);

    /** Returns all the entries on the recent files list.

        This can be used in conjunction with setRecentlyUsedFilenames() for saving the
        state of this list.

        @see setRecentlyUsedFilenames
    */
    StringArray getRecentlyUsedFilenames() const;

    /** Sets all the entries on the recent files list.

        This can be used in conjunction with getRecentlyUsedFilenames() for saving the
        state of this list.

        @see getRecentlyUsedFilenames, addRecentlyUsedFile
    */
    void setRecentlyUsedFilenames (const StringArray& filenames);

    /** Adds an entry to the recently-used files dropdown list.

        If the file is already in the list, it will be moved to the top. A limit
        is also placed on the number of items that are kept in the list.

        @see getRecentlyUsedFilenames, setRecentlyUsedFilenames, setMaxNumberOfRecentFiles
    */
    void addRecentlyUsedFile (const File& file);

    /** Changes the limit for the number of files that will be stored in the recent-file list.
    */
    void setMaxNumberOfRecentFiles (int newMaximum);

    /** Changes the text shown on the 'browse' button.

        By default this button just says "..." but you can change it. The button itself
        can be changed using the look-and-feel classes, so it might not actually have any
        text on it.
    */
    void setBrowseButtonText (const String& browseButtonText);

    //==============================================================================
    /** Adds a listener that will be called when the selected file is changed. */
    void addListener (FilenameComponentListener* listener);

    /** Removes a previously-registered listener. */
    void removeListener (FilenameComponentListener* listener);

    /** Gives the component a tooltip. */
    void setTooltip (const String& newTooltip);

    //==============================================================================
    /** @internal */
    void paintOverChildren (Graphics&) override;
    /** @internal */
    void resized() override;
    /** @internal */
    void lookAndFeelChanged() override;
    /** @internal */
    bool isInterestedInFileDrag (const StringArray&) override;
    /** @internal */
    void filesDropped (const StringArray&, int, int) override;
    /** @internal */
    void fileDragEnter (const StringArray&, int, int) override;
    /** @internal */
    void fileDragExit (const StringArray&) override;

private:
    //==============================================================================
    ComboBox filenameBox;
    String lastFilename;
    ScopedPointer<Button> browseButton;
    int maxRecentFiles;
    bool isDir, isSaving, isFileDragOver;
    String wildcard, enforcedSuffix, browseButtonText;
    ListenerList <FilenameComponentListener> listeners;
    File defaultBrowseFile;

    void comboBoxChanged (ComboBox*) override;
    void buttonClicked (Button* button) override;
    void handleAsyncUpdate() override;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (FilenameComponent)
};



#endif   // __JUCE_FILENAMECOMPONENT_JUCEHEADER__