Tracker: Fix garbled text when dragging cut poses

* Determine whether we're currently dragging by looking at the
  current window message what, dragging replaces direct in a few
  places especially crucial to drawing semi-transparent dragged
  items correctly.
* Export kMsgMouseDragged and kMsgMouseLongDown to the BPoseView
  header to check for dragging (but still in BPrivate).
* Turn on outline label drawing for dragged items and remove TODO.

Fixes #6461

Change-Id: I45cd401299dec408b76cb4b9ce1e9350ed59ef5b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8842
Reviewed-by: waddlesplash <[email protected]>

src/kits/tracker/Pose.cpp

@@ -569,6 +569,9 @@ BPose::Draw(BRect rect, const BRect& updateRect, BPoseView* poseView, BView* dra
 		fBackgroundClean = false;
 
 	bool direct = drawView == poseView;
+	bool dragging = false;
+	if (poseView->Window()->CurrentMessage() != NULL)
+		dragging = poseView->Window()->CurrentMessage()->what == kMsgMouseDragged;
 	bool windowActive = poseView->Window()->IsActive();
 	bool showSelectionWhenInactive = poseView->ShowSelectionWhenInactive();
 	bool drawIconUnselected = !windowActive && !showSelectionWhenInactive;
@@ -625,8 +628,8 @@ BPose::Draw(BRect rect, const BRect& updateRect, BPoseView* poseView, BView* dra
 				if (columnRect.Intersects(updateRect)) {
 					BRect widgetRect(widget->CalcRect(rect.LeftTop(), column, poseView));
 
-					// draw all columns after the first one unselected
-					if (index > 0)
+					// draw dragged text and all columns after the first one unselected
+					if (dragging || index > 0)
 						selected = false;
 
 					// draw text
@@ -648,6 +651,10 @@ BPose::Draw(BRect rect, const BRect& updateRect, BPoseView* poseView, BView* dra
 		if (widget != NULL && widget->IsVisible()) {
 			BRect widgetRect(widget->CalcRect(location, NULL, poseView));
 			if (widgetRect.Intersects(updateRect)) {
+				// draw dragged text unselected
+				if (dragging)
+					selected = false;
+
 				// draw text
 				DrawTextWidget(widgetRect, widgetRect, column->Width(), widget, poseView, drawView,
 					selected, fClipboardMode, offset);
@@ -788,8 +795,7 @@ BPose::WidgetFor(uint32 attr, int32* index) const
 
 
 BTextWidget*
-BPose::WidgetFor(BColumn* column, BPoseView* poseView,
-	ModelNodeLazyOpener &opener, int32* index)
+BPose::WidgetFor(BColumn* column, BPoseView* poseView, ModelNodeLazyOpener& opener, int32* index)
 {
 	if (column == NULL)
 		return NULL;

src/kits/tracker/PoseView.cpp

@@ -109,8 +109,6 @@ const float kDoubleClickTresh = 6;
 const uint32 kAddNewPoses = 'Tanp';
 const uint32 kAddPosesCompleted = 'Tapc';
 const int32 kMaxAddPosesChunk = 50;
-const uint32 kMsgMouseDragged = 'Mdrg';
-const uint32 kMsgMouseLongDown = 'Mold';
 
 const int32 kRoomForLine = 2;
 
@@ -9551,8 +9549,7 @@ BPoseView::ResizeColumnToWidest(BColumn* column)
 
 
 BPoint
-BPoseView::ResizeColumn(BColumn* column, float newSize,
-	float* lastLineDrawPos,
+BPoseView::ResizeColumn(BColumn* column, float newSize, float* lastLineDrawPos,
 	void (*drawLineFunc)(BPoseView*, BPoint, BPoint),
 	void (*undrawLineFunc)(BPoseView*, BPoint, BPoint))
 {

src/kits/tracker/PoseView.h

@@ -79,6 +79,10 @@ const uint32 kListMode = 'Tlst';
 
 const uint32 kCheckTypeahead = 'Tcty';
 
+const uint32 kMsgMouseDragged = 'Mdrg';
+const uint32 kMsgMouseLongDown = 'Mold';
+
+
 class BPoseView : public BView {
 public:
 	BPoseView(Model*, uint32 viewMode);

src/kits/tracker/TextWidget.cpp

@@ -643,7 +643,11 @@ BTextWidget::Draw(BRect eraseRect, BRect textRect, float, BPoseView* view, BView
 	// BPose::Draw before and after calling this function.
 
 	bool direct = drawView == view;
+	bool dragging = false;
+	if (view->Window()->CurrentMessage() != NULL)
+		dragging = view->Window()->CurrentMessage()->what == kMsgMouseDragged;
 
+	if (!dragging) {
 		if (selected) {
 			if (direct) {
 				// erase selection rect background
@@ -670,6 +674,8 @@ BTextWidget::Draw(BRect eraseRect, BRect textRect, float, BPoseView* view, BView
 			else
 				drawView->SetHighUIColor(view->HighUIColor());
 		}
+		drawView->SetDrawingMode(B_OP_OVER);
+	}
 
 	BPoint location;
 	location.y = textRect.bottom - view->FontInfo().descent + 1;
@@ -677,17 +683,16 @@ BTextWidget::Draw(BRect eraseRect, BRect textRect, float, BPoseView* view, BView
 
 	const char* fittingText = fText->FittingText(view);
 
-	// TODO: Comparing view and drawView here to avoid rendering
-	// the text outline when producing a drag bitmap. The check is
-	// not fully correct, since an offscreen view is also used in some
-	// other rare cases (something to do with columns). But for now, this
-	// fixes the broken drag bitmaps when dragging icons from the Desktop.
-	if (direct && !selected && view->WidgetTextOutline()) {
+	// Draw text outline unless selected or column resizing.
+	// The direct parameter is false when dragging or column resizing.
+	if (!selected && (direct || dragging) && view->WidgetTextOutline()) {
 		// draw a halo around the text by using the "false bold"
 		// feature for text rendering. Either black or white is used for
 		// the glow (whatever acts as contrast) with a some alpha value,
+		if (direct && clipboardMode != kMoveSelectionTo) {
 			drawView->SetDrawingMode(B_OP_ALPHA);
 			drawView->SetBlendingMode(B_CONSTANT_ALPHA, B_ALPHA_OVERLAY);
+		}
 
 		BFont font;
 		drawView->GetFont(&font);
@@ -733,9 +738,11 @@ BTextWidget::Draw(BRect eraseRect, BRect textRect, float, BPoseView* view, BView
 			drawView->DrawString(fittingText, location + BPoint(1, 1));
 		}
 
+		if (direct && clipboardMode != kMoveSelectionTo) {
 			drawView->SetDrawingMode(B_OP_OVER);
 			drawView->SetHighColor(textColor);
 		}
+	}
 
 	drawView->DrawString(fittingText, location);
 
@@ -746,9 +753,10 @@ BTextWidget::Draw(BRect eraseRect, BRect textRect, float, BPoseView* view, BView
 		if (direct && clipboardMode != kMoveSelectionTo) {
 			rgb_color underlineColor = drawView->HighColor();
 			underlineColor.alpha = 180;
-			drawView->SetHighColor(underlineColor);
+
 			drawView->SetDrawingMode(B_OP_ALPHA);
 			drawView->SetBlendingMode(B_CONSTANT_ALPHA, B_ALPHA_OVERLAY);
+			drawView->SetHighColor(underlineColor);
 		}
 
 		textRect.right = textRect.left + fText->Width(view);

src/kits/tracker/TextWidget.h

@@ -180,12 +180,13 @@ BTextWidget::SetActive(bool on)
 
 
 inline void
-BTextWidget::Draw(BRect widgetRect, BRect widgetTextRect, float width,
-	BPoseView* view, bool selected, uint32 clipboardMode)
+BTextWidget::Draw(BRect widgetRect, BRect widgetTextRect, float width, BPoseView* view,
+	bool selected, uint32 clipboardMode)
 {
 	Draw(widgetRect, widgetTextRect, width, view, (BView*)view, selected, clipboardMode, B_ORIGIN);
 }
 
+
 } // namespace BPrivate
 
 using namespace BPrivate;