Implemented changing the block size - that caused several changes to

DataEditor::SetViewSize()/SetViewOffset() because they did not correctly
update some values under certain circumstances.
There is now a kMsgDataEditorParameterChange instead of just ...OffsetChange;
the message will contain information about what has changed exactly.
Added a new kDataViewPreferredSize notifier that indicates a change of
the preferred size of the DataView. The ProbeView now listens to that
instead of knowing when to update the window limits.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@6772 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/diskprobe/DataEditor.cpp

@@ -665,31 +665,35 @@ DataEditor::Redo()
 }
 
 
-bool 
+bool
 DataEditor::CanUndo() const
 {
 	return fLastChange != NULL;
 }
 
 
-bool 
+bool
 DataEditor::CanRedo() const
 {
 	return fChanges.IndexOf(fLastChange) < fChanges.CountItems() - 1;
 }
 
 
-status_t 
+status_t
 DataEditor::SetFileSize(off_t size)
 {
-	fSize = size;
-	return B_OK;
+	// ToDo: implement me!
+	//fSize = size;
+	//return B_OK;
+	return B_ERROR;
 }
 
 
 status_t
 DataEditor::SetViewOffset(off_t offset, bool sendNotices)
 {
+	BAutolock locker(this);
+
 	if (fView == NULL) {
 		status_t status = SetViewSize(fViewSize);
 		if (status < B_OK)
@@ -699,15 +703,19 @@ DataEditor::SetViewOffset(off_t offset, bool sendNotices)
 	if (offset < 0 || offset > fSize)
 		return B_BAD_VALUE;
 
+	offset = (offset / fViewSize) * fViewSize;
 	if (offset == fViewOffset)
 		return B_OK;
 
-	fRealViewOffset = (offset / fBlockSize) * fBlockSize;
 	fViewOffset = offset;
+	fRealViewOffset = (fViewOffset / fBlockSize) * fBlockSize;
 	fNeedsUpdate = true;
 
-	if (sendNotices)
-		SendNotices(kMsgDataEditorOffsetChange);
+	if (sendNotices) {
+		BMessage update;
+		update.AddInt64("offset", fViewOffset);
+		SendNotices(kMsgDataEditorParameterChange, &update);
+	}
 
 	return B_OK;
 }
@@ -721,39 +729,73 @@ DataEditor::SetViewOffset(off_t offset)
 
 
 status_t 
-DataEditor::SetViewSize(size_t size)
+DataEditor::SetViewSize(size_t size, bool sendNotices)
 {
+	BAutolock locker(this);
+
 	size_t realSize = (size + fBlockSize - 1) & ~(fBlockSize - 1);
 		// round to the next multiple of block size
 
-	if (realSize == fRealViewSize && fView != NULL) {
-		fViewSize = size;
+	if (realSize == fRealViewSize && fViewSize == size && fView != NULL)
 		return B_OK;
-	}
+
 	if (realSize == 0)
 		return B_BAD_VALUE;
 
-	uint8 *view = (uint8 *)realloc(fView, realSize);
-	if (view == NULL)
-		return B_NO_MEMORY;
+	if (realSize != fRealViewSize || fView == NULL) {
+		uint8 *view = (uint8 *)realloc(fView, realSize);
+		if (view == NULL)
+			return B_NO_MEMORY;
+
+		fView = view;
+		fRealViewSize = realSize;
+	}
 
-	fView = view;
-	fRealViewSize = realSize;
 	fViewSize = size;
 	fNeedsUpdate = true;
 
+	// let's correct the view offset if necessary
+	if (fViewOffset % size)
+		SetViewOffset(fViewOffset);
+
+	if (sendNotices) {
+		BMessage update;
+		update.AddInt32("view_size", size);
+		SendNotices(kMsgDataEditorParameterChange, &update);
+	}
+
 	return B_OK;
 }
 
 
-void 
-DataEditor::SetBlockSize(size_t size)
+status_t
+DataEditor::SetViewSize(size_t size)
 {
-	fBlockSize = size;
+	return SetViewSize(size, true);
 }
 
 
-status_t 
+status_t
+DataEditor::SetBlockSize(size_t size)
+{
+	BAutolock locker(this);
+
+	fBlockSize = size;
+	status_t status = SetViewOffset(fViewOffset, false);
+		// this will trigger an update of the real view offset
+	if (status == B_OK)
+		status = SetViewSize(fViewSize, false);
+
+	BMessage update;
+	update.AddInt32("block_size", size);
+	update.AddInt64("offset", fViewOffset);
+	SendNotices(kMsgDataEditorParameterChange, &update);
+
+	return status;
+}
+
+
+status_t
 DataEditor::Update()
 {
 	ssize_t bytesRead;
@@ -811,7 +853,7 @@ DataEditor::GetViewBuffer(const uint8 **_buffer)
 }
 
 
-void 
+void
 DataEditor::SendNotices(DataChange *change)
 {
 	off_t offset, size;

src/apps/diskprobe/DataEditor.h

@@ -61,7 +61,7 @@ class DataEditor : public BLocker {
 		status_t SetViewSize(size_t size);
 		size_t ViewSize() const { return fViewSize; }
 
-		void SetBlockSize(size_t size);
+		status_t SetBlockSize(size_t size);
 		size_t BlockSize() const { return fBlockSize; }
 
 		status_t UpdateIfNeeded(bool *_updated = NULL);
@@ -79,6 +79,7 @@ class DataEditor : public BLocker {
 		friend class StateWatcher;
 
 		status_t SetViewOffset(off_t offset, bool sendNotices);
+		status_t SetViewSize(size_t size, bool sendNotices);
 		void SendNotices(uint32 what, BMessage *message = NULL);
 		void SendNotices(DataChange *change);
 		status_t Update();
@@ -110,6 +111,6 @@ class DataEditor : public BLocker {
 
 static const uint32 kMsgDataEditorStateChange = 'deSC';
 static const uint32 kMsgDataEditorUpdate = 'deUp';
-static const uint32 kMsgDataEditorOffsetChange = 'deOC';
+static const uint32 kMsgDataEditorParameterChange = 'dePC';
 
 #endif	/* DATA_EDITOR_H */

src/apps/diskprobe/DataView.cpp

@@ -160,10 +160,22 @@ DataView::MessageReceived(BMessage *message)
 			UpdateFromEditor(message);
 			break;
 
-		case kMsgDataEditorOffsetChange:
-			fOffset = fEditor.ViewOffset();
-			SetSelection(0, 0);
+		case kMsgDataEditorParameterChange:
+		{
+			int32 viewSize;
+			off_t offset;
+			if (message->FindInt64("offset", &offset) == B_OK) {
+				fOffset = offset;
+				SetSelection(0, 0);
+				MakeVisible(0);
+			} 
+			if (message->FindInt32("view_size", &viewSize) == B_OK) {
+				fDataSize = viewSize;
+				fData = (uint8 *)realloc(fData, fDataSize);
+				UpdateScroller();
+			}
 			break;
+		}
 
 		case kMsgBaseType:
 		{
@@ -1055,6 +1067,8 @@ DataView::SetFontSize(float point)
 	SetFont(&font);
 	UpdateScroller();
 	Invalidate();
+
+	SendNotices(kDataViewPreferredSize);
 }
 
 

src/apps/diskprobe/DataView.h

@@ -102,5 +102,6 @@ static const uint32 kMsgUpdateData = 'updt';
 // observer notices
 static const uint32 kDataViewCursorPosition = 'curs';
 static const uint32 kDataViewSelection = 'dsel';
+static const uint32 kDataViewPreferredSize = 'dvps';
 
 #endif	/* DATA_VIEW_H */

src/apps/diskprobe/ProbeView.cpp

@@ -48,6 +48,7 @@ static const uint32 kMsgSliderUpdate = 'slup';
 static const uint32 kMsgPositionUpdate = 'poup';
 static const uint32 kMsgLastPosition = 'lpos';
 static const uint32 kMsgFontSize = 'fnts';
+static const uint32 kMsgBlockSize = 'blks';
 static const uint32 kMsgPrint = 'prnt';
 static const uint32 kMsgPageSetup = 'pgsp';
 
@@ -110,6 +111,10 @@ class HeaderView : public BView, public BInvoker {
 
 		base_type Base() const { return fBase; }
 		void SetBase(base_type);
+		
+		off_t Position() const { return fPosition; }
+		uint32 BlockSize() const { return fBlockSize; }
+		void SetTo(off_t position, uint32 blockSize);
 
 	private:
 		void FormatValue(char *buffer, size_t bufferSize, off_t value);
@@ -622,6 +627,20 @@ HeaderView::SetBase(base_type type)
 }
 
 
+void 
+HeaderView::SetTo(off_t position, uint32 blockSize)
+{
+	fPosition = position;
+	fLastPosition = (fLastPosition / fBlockSize) * blockSize;
+	fBlockSize = blockSize;
+
+	fPositionSlider->SetBlockSize(blockSize);
+	UpdatePositionViews();
+	UpdateOffsetViews(false);
+	UpdateFileSizeView();
+}
+
+
 void
 HeaderView::NotifyTarget()
 {
@@ -828,7 +847,7 @@ UpdateLooper::MessageReceived(BMessage *message)
 			break;
 		}
 
-		case kMsgDataEditorOffsetChange:
+		case kMsgDataEditorParameterChange:
 		{
 			bool updated = false;
 
@@ -1127,10 +1146,14 @@ ProbeView::AttachedToWindow()
 	// Block Size
 
 	subMenu = new BMenu("BlockSize");
-	subMenu->AddItem(item = new BMenuItem("512", NULL));
+	subMenu->AddItem(item = new BMenuItem("512", message = new BMessage(kMsgBlockSize)));
+	message->AddInt32("block_size", 512);
 	item->SetMarked(true);
-	subMenu->AddItem(new BMenuItem("1024", NULL));
-	subMenu->AddItem(new BMenuItem("2048", NULL));
+	subMenu->AddItem(new BMenuItem("1024", message = new BMessage(kMsgBlockSize)));
+	message->AddInt32("block_size", 1024);
+	subMenu->AddItem(new BMenuItem("2048", message = new BMessage(kMsgBlockSize)));
+	message->AddInt32("block_size", 2048);
+	subMenu->SetTargetForItems(this);
 	subMenu->SetRadioMode(true);
 	menu->AddItem(new BMenuItem(subMenu));
 	menu->AddSeparatorItem();
@@ -1161,7 +1184,7 @@ ProbeView::AttachedToWindow()
 }
 
 
-void 
+void
 ProbeView::AllAttached()
 {
 	fHeaderView->SetTarget(fUpdateLooper);
@@ -1176,7 +1199,7 @@ ProbeView::WindowActivated(bool active)
 }
 
 
-void 
+void
 ProbeView::UpdateSelectionMenuItems(int64 start, int64 end)
 {
 	int64 position = 0;
@@ -1354,6 +1377,9 @@ ProbeView::MessageReceived(BMessage *message)
 						UpdateSelectionMenuItems(start, end);
 					break;
 				}
+				case kDataViewPreferredSize:
+					UpdateSizeLimits();
+					break;
 			}
 			break;
 		}
@@ -1383,9 +1409,10 @@ ProbeView::MessageReceived(BMessage *message)
 		{
 			float size = 0.0f;
 			message->FindFloat("font_size", &size);
+				// if there is no "font_size" member, the size will
+				// be adapted to fit the window size (0)
 
 			fDataView->SetFontSize(size);
-			UpdateSizeLimits();
 
 			// update the applications settings
 			BMessage update(*message);
@@ -1394,6 +1421,20 @@ ProbeView::MessageReceived(BMessage *message)
 			break;
 		}
 
+		case kMsgBlockSize:
+		{
+			int32 blockSize;
+			if (message->FindInt32("block_size", &blockSize) != B_OK)
+				break;
+
+			BAutolock locker(fEditor);
+
+			if (fEditor.SetViewSize(blockSize) == B_OK
+				&& fEditor.SetBlockSize(blockSize) == B_OK)
+				fHeaderView->SetTo(fEditor.ViewOffset(), blockSize);
+			break;
+		}
+
 		case kMsgPrint:
 			Print();
 			break;