mirror of https://github.com/dcoredump/dexed.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
294 lines
13 KiB
294 lines
13 KiB
/*
|
|
==============================================================================
|
|
|
|
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_FILEBASEDDOCUMENT_H_INCLUDED
|
|
#define JUCE_FILEBASEDDOCUMENT_H_INCLUDED
|
|
|
|
|
|
//==============================================================================
|
|
/**
|
|
A class to take care of the logic involved with the loading/saving of some kind
|
|
of document.
|
|
|
|
There's quite a lot of tedious logic involved in writing all the load/save/save-as
|
|
functions you need for documents that get saved to a file, so this class attempts
|
|
to abstract most of the boring stuff.
|
|
|
|
Your subclass should just implement all the pure virtual methods, and you can
|
|
then use the higher-level public methods to do the load/save dialogs, to warn the user
|
|
about overwriting files, etc.
|
|
|
|
The document object keeps track of whether it has changed since it was last saved or
|
|
loaded, so when you change something, call its changed() method. This will set a
|
|
flag so it knows it needs saving, and will also broadcast a change message using the
|
|
ChangeBroadcaster base class.
|
|
|
|
@see ChangeBroadcaster
|
|
*/
|
|
class JUCE_API FileBasedDocument : public ChangeBroadcaster
|
|
{
|
|
public:
|
|
/** Creates a FileBasedDocument.
|
|
|
|
@param fileExtension the extension to use when loading/saving files, e.g. ".doc"
|
|
@param fileWildCard the wildcard to use in file dialogs, e.g. "*.doc"
|
|
@param openFileDialogTitle the title to show on an open-file dialog, e.g. "Choose a file to open.."
|
|
@param saveFileDialogTitle the title to show on an save-file dialog, e.g. "Choose a file to save as.."
|
|
*/
|
|
FileBasedDocument (const String& fileExtension,
|
|
const String& fileWildCard,
|
|
const String& openFileDialogTitle,
|
|
const String& saveFileDialogTitle);
|
|
|
|
/** Destructor. */
|
|
virtual ~FileBasedDocument();
|
|
|
|
//==============================================================================
|
|
/** Returns true if the changed() method has been called since the file was
|
|
last saved or loaded.
|
|
|
|
@see setChangedFlag, changed
|
|
*/
|
|
bool hasChangedSinceSaved() const { return changedSinceSave; }
|
|
|
|
/** Called to indicate that the document has changed and needs saving.
|
|
|
|
This method will also trigger a change message to be sent out using the
|
|
ChangeBroadcaster base class.
|
|
|
|
After calling the method, the hasChangedSinceSaved() method will return true, until
|
|
it is reset either by saving to a file or using the setChangedFlag() method.
|
|
|
|
@see hasChangedSinceSaved, setChangedFlag
|
|
*/
|
|
virtual void changed();
|
|
|
|
/** Sets the state of the 'changed' flag.
|
|
|
|
The 'changed' flag is set to true when the changed() method is called - use this method
|
|
to reset it or to set it without also broadcasting a change message.
|
|
|
|
@see changed, hasChangedSinceSaved
|
|
*/
|
|
void setChangedFlag (bool hasChanged);
|
|
|
|
//==============================================================================
|
|
/** Tries to open a file.
|
|
|
|
If the file opens correctly, the document's file (see the getFile() method) is set
|
|
to this new one; if it fails, the document's file is left unchanged, and optionally
|
|
a message box is shown telling the user there was an error.
|
|
|
|
@returns A result indicating whether the new file loaded successfully, or the error
|
|
message if it failed.
|
|
@see loadDocument, loadFromUserSpecifiedFile
|
|
*/
|
|
Result loadFrom (const File& fileToLoadFrom,
|
|
bool showMessageOnFailure);
|
|
|
|
/** Asks the user for a file and tries to load it.
|
|
|
|
This will pop up a dialog box using the title, file extension and
|
|
wildcard specified in the document's constructor, and asks the user
|
|
for a file. If they pick one, the loadFrom() method is used to
|
|
try to load it, optionally showing a message if it fails.
|
|
|
|
@returns a result indicating success; This will be a failure message if the user
|
|
cancelled or if they picked a file which failed to load correctly
|
|
@see loadFrom
|
|
*/
|
|
Result loadFromUserSpecifiedFile (bool showMessageOnFailure);
|
|
|
|
//==============================================================================
|
|
/** A set of possible outcomes of one of the save() methods
|
|
*/
|
|
enum SaveResult
|
|
{
|
|
savedOk = 0, /**< indicates that a file was saved successfully. */
|
|
userCancelledSave, /**< indicates that the user aborted the save operation. */
|
|
failedToWriteToFile /**< indicates that it tried to write to a file but this failed. */
|
|
};
|
|
|
|
/** Tries to save the document to the last file it was saved or loaded from.
|
|
|
|
This will always try to write to the file, even if the document isn't flagged as
|
|
having changed.
|
|
|
|
@param askUserForFileIfNotSpecified if there's no file currently specified and this is
|
|
true, it will prompt the user to pick a file, as if
|
|
saveAsInteractive() was called.
|
|
@param showMessageOnFailure if true it will show a warning message when if the
|
|
save operation fails
|
|
@see saveIfNeededAndUserAgrees, saveAs, saveAsInteractive
|
|
*/
|
|
SaveResult save (bool askUserForFileIfNotSpecified,
|
|
bool showMessageOnFailure);
|
|
|
|
/** If the file needs saving, it'll ask the user if that's what they want to do, and save
|
|
it if they say yes.
|
|
|
|
If you've got a document open and want to close it (e.g. to quit the app), this is the
|
|
method to call.
|
|
|
|
If the document doesn't need saving it'll return the value savedOk so
|
|
you can go ahead and delete the document.
|
|
|
|
If it does need saving it'll prompt the user, and if they say "discard changes" it'll
|
|
return savedOk, so again, you can safely delete the document.
|
|
|
|
If the user clicks "cancel", it'll return userCancelledSave, so if you can abort the
|
|
close-document operation.
|
|
|
|
And if they click "save changes", it'll try to save and either return savedOk, or
|
|
failedToWriteToFile if there was a problem.
|
|
|
|
@see save, saveAs, saveAsInteractive
|
|
*/
|
|
SaveResult saveIfNeededAndUserAgrees();
|
|
|
|
/** Tries to save the document to a specified file.
|
|
|
|
If this succeeds, it'll also change the document's internal file (as returned by
|
|
the getFile() method). If it fails, the file will be left unchanged.
|
|
|
|
@param newFile the file to try to write to
|
|
@param warnAboutOverwritingExistingFiles if true and the file exists, it'll ask
|
|
the user first if they want to overwrite it
|
|
@param askUserForFileIfNotSpecified if the file is non-existent and this is true, it'll
|
|
use the saveAsInteractive() method to ask the user for a
|
|
filename
|
|
@param showMessageOnFailure if true and the write operation fails, it'll show
|
|
a message box to warn the user
|
|
@see saveIfNeededAndUserAgrees, save, saveAsInteractive
|
|
*/
|
|
SaveResult saveAs (const File& newFile,
|
|
bool warnAboutOverwritingExistingFiles,
|
|
bool askUserForFileIfNotSpecified,
|
|
bool showMessageOnFailure);
|
|
|
|
/** Prompts the user for a filename and tries to save to it.
|
|
|
|
This will pop up a dialog box using the title, file extension and
|
|
wildcard specified in the document's constructor, and asks the user
|
|
for a file. If they pick one, the saveAs() method is used to try to save
|
|
to this file.
|
|
|
|
@param warnAboutOverwritingExistingFiles if true and the file exists, it'll ask
|
|
the user first if they want to overwrite it
|
|
@see saveIfNeededAndUserAgrees, save, saveAs
|
|
*/
|
|
SaveResult saveAsInteractive (bool warnAboutOverwritingExistingFiles);
|
|
|
|
//==============================================================================
|
|
/** Returns the file that this document was last successfully saved or loaded from.
|
|
|
|
When the document object is created, this will be set to File::nonexistent.
|
|
|
|
It is changed when one of the load or save methods is used, or when setFile()
|
|
is used to explicitly set it.
|
|
*/
|
|
const File& getFile() const { return documentFile; }
|
|
|
|
/** Sets the file that this document thinks it was loaded from.
|
|
|
|
This won't actually load anything - it just changes the file stored internally.
|
|
|
|
@see getFile
|
|
*/
|
|
void setFile (const File& newFile);
|
|
|
|
|
|
protected:
|
|
//==============================================================================
|
|
/** Overload this to return the title of the document.
|
|
|
|
This is used in message boxes, filenames and file choosers, so it should be
|
|
something sensible.
|
|
*/
|
|
virtual String getDocumentTitle() = 0;
|
|
|
|
/** This method should try to load your document from the given file.
|
|
@returns a Result object to indicate the whether there was an error.
|
|
*/
|
|
virtual Result loadDocument (const File& file) = 0;
|
|
|
|
/** This method should try to write your document to the given file.
|
|
@returns a Result object to indicate the whether there was an error.
|
|
*/
|
|
virtual Result saveDocument (const File& file) = 0;
|
|
|
|
/** This is used for dialog boxes to make them open at the last folder you
|
|
were using.
|
|
|
|
getLastDocumentOpened() and setLastDocumentOpened() are used to store
|
|
the last document that was used - you might want to store this value
|
|
in a static variable, or even in your application's properties. It should
|
|
be a global setting rather than a property of this object.
|
|
|
|
This method works very well in conjunction with a RecentlyOpenedFilesList
|
|
object to manage your recent-files list.
|
|
|
|
As a default value, it's ok to return File::nonexistent, and the document
|
|
object will use a sensible one instead.
|
|
|
|
@see RecentlyOpenedFilesList
|
|
*/
|
|
virtual File getLastDocumentOpened() = 0;
|
|
|
|
/** This is used for dialog boxes to make them open at the last folder you
|
|
were using.
|
|
|
|
getLastDocumentOpened() and setLastDocumentOpened() are used to store
|
|
the last document that was used - you might want to store this value
|
|
in a static variable, or even in your application's properties. It should
|
|
be a global setting rather than a property of this object.
|
|
|
|
This method works very well in conjunction with a RecentlyOpenedFilesList
|
|
object to manage your recent-files list.
|
|
|
|
@see RecentlyOpenedFilesList
|
|
*/
|
|
virtual void setLastDocumentOpened (const File& file) = 0;
|
|
|
|
#if JUCE_MODAL_LOOPS_PERMITTED
|
|
/** This is called by saveAsInteractive() to allow you to optionally customise the
|
|
filename that the user is presented with in the save dialog.
|
|
The defaultFile parameter is an initial suggestion based on what the class knows
|
|
about the current document - you can return a variation on this file with a different
|
|
extension, etc, or just return something completely different.
|
|
*/
|
|
virtual File getSuggestedSaveAsFile (const File& defaultFile);
|
|
#endif
|
|
|
|
private:
|
|
//==============================================================================
|
|
File documentFile;
|
|
bool changedSinceSave;
|
|
String fileExtension, fileWildcard, openFileDialogTitle, saveFileDialogTitle;
|
|
|
|
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (FileBasedDocument)
|
|
};
|
|
|
|
|
|
#endif // JUCE_FILEBASEDDOCUMENT_H_INCLUDED
|
|
|