Use Tracker Scripting to find next/previous image.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@6203 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/showimage/ShowImageApp.cpp

@@ -150,6 +150,13 @@ ShowImageApp::MessageReceived(BMessage *pmsg)
 void
 ShowImageApp::RefsReceived(BMessage *pmsg)
 {
+	//
+	// If a tracker window opened me, get a messenger from it.
+	//
+	if (pmsg->HasMessenger("TrackerViewToken")) {
+		pmsg->FindMessenger("TrackerViewToken", &fTrackerMessenger);
+	}
+
 	uint32 type;
 	int32 count;
 	status_t ret = pmsg->GetInfo("refs", &type, &count);
@@ -166,7 +173,7 @@ ShowImageApp::RefsReceived(BMessage *pmsg)
 void
 ShowImageApp::Open(const entry_ref *pref)
 {
-	new ShowImageWindow(pref);
+	new ShowImageWindow(pref, fTrackerMessenger);
 }
 
 void

src/apps/showimage/ShowImageApp.h

@@ -54,6 +54,7 @@ private:
 	void BroadcastToWindows(BMessage *pmsg);
 	void CheckClipboard();
 
+	BMessenger fTrackerMessenger; // of the window this was launched
 	BFilePanel *fOpenPanel;
 	bool fPulseStarted;
 	ShowImageSettings fSettings;

src/apps/showimage/ShowImageView.cpp

@@ -252,6 +252,12 @@ ShowImageView::IsImage(const entry_ref *pref)
 	return true;
 }
 
+void
+ShowImageView::SetTrackerMessenger(const BMessenger& trackerMessenger)
+{
+	fTrackerMessenger = trackerMessenger;
+}
+
 // send message to parent about new image
 void 
 ShowImageView::Notify(const char* status)
@@ -1879,62 +1885,61 @@ ShowImageView::FreeEntries(BList* entries)
 	entries->MakeEmpty();
 }
 
-bool
+
-ShowImageView::FindNextImage(entry_ref *in_current, entry_ref *out_image, bool next, bool rewind)
+void 
+ShowImageView::SetTrackerSelectionToCurrent()
 {
-	ASSERT(next || !rewind);
+	BMessage setsel(B_SET_PROPERTY);
-	BEntry curImage(in_current);
+	setsel.AddSpecifier("Selection");
-	entry_ref entry, *ref;
+	setsel.AddRef("data", &fCurrentRef);
-	BDirectory parent;
+	fTrackerMessenger.SendMessage(&setsel);
-	BList entries;
+}
-	bool found = false;
+
-	int32 cur;
+bool
-	
+ShowImageView::FindNextImage(entry_ref *in_current, entry_ref *ref, bool next, bool rewind)
-	if (curImage.GetParent(&parent) != B_OK)
+{
+	// shamelessly stolen, I mean copied from BeMail!
+	// XXX rewind is not implemented yet => slide show will stop with last image
+
+	if (!fTrackerMessenger.IsValid())
 		return false;
 
-	while (parent.GetNextRef(&entry) == B_OK) {
+	//
-		if (entry != *in_current) {
+	//	Ask the Tracker what the next/prev file in the window is.
-			entries.AddItem(new entry_ref(entry));
+	//	Continue asking for the next reference until a valid
-		} else {
+	//	image is found.
-			// insert current ref, so we can find it easily after sorting
+	//
-			entries.AddItem(in_current);
+	entry_ref nextRef = *in_current;
-		}
+	bool foundRef = false;
-	}
+	while (!foundRef)
-	
+	{
-	entries.SortItems(CompareEntries);
+		BMessage request(B_GET_PROPERTY);
-	
+		BMessage spc;
-	cur = entries.IndexOf(in_current);
+		if (next)
-	ASSERT(cur >= 0);
+			spc.what = 'snxt';
+		else
+			spc.what = 'sprv';
 
-	// remove it so FreeEntries() does not delete it
+		spc.AddString("property", "Entry");
-	entries.RemoveItem(in_current);
+		spc.AddRef("data", &nextRef);
-	
+
-	if (next) {
+		request.AddSpecifier(&spc);
-		// find the next image in the list
+		BMessage reply;
-		if (rewind) cur = 0; // start with first
+		if (fTrackerMessenger.SendMessage(&request, &reply) != B_OK) {
-		for (; (ref = (entry_ref*)entries.ItemAt(cur)) != NULL; cur ++) {
+			return false;
-			if (IsImage(ref)) {
-				found = true;
-				*out_image = (const entry_ref)*ref;
-				break;
-			}
 		}
-	} else {
+		
-		// find the previous image in the list
+		if (reply.FindRef("result", &nextRef) != B_OK) {
-		cur --;
+			return false;
-		for (; cur >= 0; cur --) {
+		}
-			ref = (entry_ref*)entries.ItemAt(cur);
+		
-			if (IsImage(ref)) {
+		if (IsImage(&nextRef)) {
-				found = true;
+			foundRef = true;
-				*out_image = (const entry_ref)*ref;
-				break;
-			}
 		}
 	}
 
-	FreeEntries(&entries);
+	*ref = nextRef;
-	return found;
+	return foundRef;
 }
 
 bool
@@ -1957,6 +1962,7 @@ ShowImageView::ShowNextImage(bool next, bool rewind)
 			if (!found)
 				return false;
 		}
+		SetTrackerSelectionToCurrent();
 		return true;
 	}
 	return false;
@@ -1974,6 +1980,20 @@ ShowImageView::PrevFile()
 	return ShowNextImage(false, false);
 }
 
+bool
+ShowImageView::HasNextFile()
+{
+	entry_ref ref;
+	return FindNextImage(&fCurrentRef, &ref, true, false);
+}
+
+bool
+ShowImageView::HasPrevFile()
+{
+	entry_ref ref;
+	return FindNextImage(&fCurrentRef, &ref, false, false);
+}
+
 bool
 ShowImageView::FirstFile()
 {
@@ -2087,26 +2107,31 @@ ShowImageView::DoImageOperation(ImageProcessor::operation op, bool quiet)
 	}	
 }
 
+// image operation initiated by user
+void
+ShowImageView::UserDoImageOperation(ImageProcessor::operation op, bool quiet)
+{
+	fUndo.Clear();
+	DoImageOperation(op, quiet);
+}
+
 void
 ShowImageView::Rotate(int degree)
 {
 	if (degree == 90) {
-		fUndo.Clear();
+		UserDoImageOperation(ImageProcessor::kRotateClockwise);
-		DoImageOperation(ImageProcessor::kRotateClockwise);
 	} else if (degree == 270) {
-		fUndo.Clear();
+		UserDoImageOperation(ImageProcessor::kRotateAntiClockwise);
-		DoImageOperation(ImageProcessor::kRotateAntiClockwise);
 	}
 }
 
 void
 ShowImageView::Mirror(bool vertical) 
 {
-	fUndo.Clear();
 	if (vertical) {
-		DoImageOperation(ImageProcessor::kMirrorVertical);
+		UserDoImageOperation(ImageProcessor::kMirrorVertical);
 	} else {
-		DoImageOperation(ImageProcessor::kMirrorHorizontal);
+		UserDoImageOperation(ImageProcessor::kMirrorHorizontal);
 	}
 }
 
@@ -2117,8 +2142,7 @@ ShowImageView::Invert()
 		// Only allow an invert operation if the
 		// bitmap color space is supported by the
 		// invert algorithm
-		fUndo.Clear();
+		UserDoImageOperation(ImageProcessor::kInvert);
-		DoImageOperation(ImageProcessor::kInvert);
 	}
 }
 

src/apps/showimage/ShowImageView.h

@@ -39,6 +39,7 @@
 #include "Filter.h"
 #include "ShowImageUndo.h"
 
+// delay scaling operation, so that a sequence of zoom in/out operations works smoother
 #define DELAYED_SCALING 1
 
 class ShowImageView : public BView {
@@ -49,6 +50,7 @@ public:
 	
 	void Pulse();
 	
+	void SetTrackerMessenger(const BMessenger& trackerMessenger);
 	status_t SetImage(const entry_ref *pref);
 	void SaveToFile(BDirectory* dir, const char* name, BBitmap* bitmap, const translation_format* format);
 	void SetDither(bool dither);
@@ -99,6 +101,8 @@ public:
 	void GoToPage(int32 page);
 	bool NextFile();
 	bool PrevFile();
+	bool HasNextFile();
+	bool HasPrevFile();
 	void SetSlideShowDelay(float seconds);
 	float GetSlideShowDelay() const { return fSlideShowDelay / 10.0; }
 	bool SlideShowStarted() const { return fSlideShow; }
@@ -150,6 +154,7 @@ private:
 	inline void CopyPixel(uchar* dest, int32 destX, int32 destY, int32 destBPR, uchar* src, int32 x, int32 y, int32 bpr, int32 bpp);
 	inline void InvertPixel(int32 x, int32 y, uchar* dest, int32 destBPR, uchar* src, int32 bpr, int32 bpp);
 	void DoImageOperation(enum ImageProcessor::operation op, bool quiet = false);
+	void UserDoImageOperation(enum ImageProcessor::operation op, bool quiet = false);
 	BRect AlignBitmap();
 	void Setup(BRect r);
 	BPoint ImageToView(BPoint p) const;
@@ -158,6 +163,7 @@ private:
 	bool IsImage(const entry_ref* pref);
 	static int CompareEntries(const void* a, const void* b);
 	void FreeEntries(BList* entries);
+	void SetTrackerSelectionToCurrent();
 	bool FindNextImage(entry_ref *in_current, entry_ref *out_image, bool next, bool rewind);
 	bool ShowNextImage(bool next, bool rewind);
 	bool FirstFile();
@@ -189,6 +195,7 @@ private:
 	void SettingsSetBool(const char* name, bool value);
 	void SetIcon(bool clear, icon_size which);
 	
+	BMessenger fTrackerMessenger; // of the window that this was launched from
 	entry_ref fCurrentRef; // of the image
 	bool fDither;          // dither the image
 	int32 fDocumentIndex;  // of the image in the file

src/apps/showimage/ShowImageWindow.cpp

@@ -93,7 +93,7 @@ RecentDocumentsMenu::AddDynamicItem(add_state s)
 
 // Implementation of ShowImageWindow
 
-ShowImageWindow::ShowImageWindow(const entry_ref *pref)
+ShowImageWindow::ShowImageWindow(const entry_ref *pref, const BMessenger& trackerMessenger)
 	: BWindow(BRect(5, 24, 250, 100), "", B_DOCUMENT_WINDOW, 0)
 {
 	fSavePanel = NULL;
@@ -154,8 +154,9 @@ ShowImageWindow::ShowImageWindow(const entry_ref *pref)
 	
 	SetSizeLimits(250, 100000, 100, 100000);
 	
-	// finish creating window
+	// finish creating the window
 	fImageView->SetImage(pref);
+	fImageView->SetTrackerMessenger(trackerMessenger);
 
 	if (InitCheck() == B_OK) {
 		// add View menu here so it can access ShowImageView methods 
@@ -512,6 +513,9 @@ ShowImageWindow::MessageReceived(BMessage *pmsg)
 			EnableMenuItem(fBar, MSG_PAGE_NEXT, benable);
 			EnableMenuItem(fBar, MSG_PAGE_PREV, benable);
 			
+			EnableMenuItem(fBar, MSG_FILE_NEXT, fImageView->HasNextFile());
+			EnableMenuItem(fBar, MSG_FILE_PREV, fImageView->HasPrevFile());
+			
 			if (fGoToPageMenu->CountItems() != pages) {
 				// Only rebuild the submenu if the number of
 				// pages is different
@@ -759,7 +763,7 @@ ShowImageWindow::MessageReceived(BMessage *pmsg)
 		case MSG_SCALE_BILINEAR:
 			fImageView->SetScaleBilinear(ToggleMenuItem(pmsg->what));
 			break;
-					
+
 		default:
 			BWindow::MessageReceived(pmsg);
 			break;

src/apps/showimage/ShowImageWindow.h

@@ -56,7 +56,7 @@ private:
 
 class ShowImageWindow : public BWindow {
 public:
-	ShowImageWindow(const entry_ref *pref);
+	ShowImageWindow(const entry_ref *pref, const BMessenger& trackerMessenger);
 	virtual ~ShowImageWindow();
 
 	virtual void FrameResized(float width, float height);