BStringView: add support for multiline strings

* Actually draw the string at the bottom of the frame.
* Unfortunately BStringList cannot be cached because there is no
  space left in the class.
* Change SGI and PNG translators to use it in place of BTextView.

Change-Id: I07e12bf1a8dc956d18c9624604c7b63453ad15a2
Reviewed-on: https://review.haiku-os.org/620
Reviewed-by: waddlesplash <[email protected]>

headers/os/interface/StringView.h

@@ -79,6 +79,7 @@ private:
 
 private:
 			BSize				_ValidatePreferredSize();
+			float				_StringWidth(const char* text);
 
 private:
 			char*				fText;

src/add-ons/translators/png/PNGView.cpp

@@ -18,7 +18,6 @@
 #include <MenuItem.h>
 #include <PopUpMenu.h>
 #include <StringView.h>
-#include <TextView.h>
 
 #include <stdio.h>
 #define PNG_NO_PEDANTIC_WARNINGS
@@ -69,13 +68,10 @@ PNGView::PNGView(const BRect &frame, const char *name, uint32 resizeMode,
 	menuField->SetDivider(menuField->StringWidth(menuField->Label()) + 7.0f);
 	menuField->ResizeToPreferred();
 
-	fCopyrightView = new BTextView("PNG copyright");
-	fCopyrightView->SetViewUIColor(B_PANEL_BACKGROUND_COLOR);
-	fCopyrightView->SetLowColor(fCopyrightView->ViewColor());
-	fCopyrightView->MakeEditable(false);
-	fCopyrightView->SetWordWrap(false);
-	fCopyrightView->MakeResizable(true);
-	fCopyrightView->SetText(png_get_copyright(NULL));
+	BString pngCopyright = png_get_copyright(NULL);
+	pngCopyright.ReplaceLast("\n", "");
+	BStringView* pngCopyrightView = new BStringView(
+		"PNG copyright", pngCopyright);
 
 	BLayoutBuilder::Group<>(this, B_VERTICAL, 0)
 		.SetInsets(B_USE_DEFAULT_SPACING)
@@ -88,7 +84,7 @@ PNGView::PNGView(const BRect &frame, const char *name, uint32 resizeMode,
 			.AddGlue()
 			.End()
 		.AddGlue()
-		.Add(fCopyrightView);
+		.Add(pngCopyrightView);
 }
 
 
@@ -118,14 +114,6 @@ PNGView::AttachedToWindow()
 }
 
 
-void
-PNGView::FrameResized(float width, float height)
-{
-	// This works around a flaw of BTextView
-	fCopyrightView->SetTextRect(fCopyrightView->Bounds());
-}
-
-
 void
 PNGView::MessageReceived(BMessage *message)
 {

src/add-ons/translators/png/PNGView.h

@@ -15,7 +15,6 @@
 #include <View.h>
 
 class BPopUpMenu;
-class BTextView;
 
 
 // Config panel messages
@@ -33,7 +32,6 @@ class PNGView : public BView {
 		~PNGView();
 
 		virtual void AttachedToWindow();
-		virtual void FrameResized(float width, float height);
 		virtual void MessageReceived(BMessage *message);
 
 	private:
@@ -41,7 +39,6 @@ class PNGView : public BView {
 
 	private:
 		BPopUpMenu*			fInterlaceMenu;
-		BTextView*			fCopyrightView;
 		TranslatorSettings*	fSettings;
 			// the actual settings for the translator,
 			// shared with the translator

src/add-ons/translators/sgi/SGIView.cpp

@@ -44,7 +44,6 @@
 #include <PopUpMenu.h>
 #include <String.h>
 #include <StringView.h>
-#include <TextView.h>
 #include <Window.h>
 
 #include "SGIImage.h"
@@ -114,16 +113,11 @@ SGIView::SGIView(const char* name, uint32 flags, TranslatorSettings* settings)
 	BStringView* detailView = new BStringView("details", detail);
 	detailView->SetExplicitAlignment(labelAlignment);
 
-	BTextView* infoView = new BTextView("info");
-	infoView->SetText(BString(B_TRANSLATE("written by:\n"))
+	BStringView* infoView = new BStringView("info",
+		BString(B_TRANSLATE("written by:\n"))
 			.Append(author)
 			.Append(B_TRANSLATE("\nbased on GIMP SGI plugin v1.5:\n"))
 			.Append(kSGICopyright).String());
-	infoView->SetExplicitAlignment(labelAlignment);
-	infoView->SetWordWrap(false);
-	infoView->MakeEditable(false);
-	infoView->MakeResizable(true);
-	infoView->SetViewUIColor(B_PANEL_BACKGROUND_COLOR);
 
 	BLayoutBuilder::Group<>(this, B_VERTICAL, 0)
 		.SetInsets(B_USE_DEFAULT_SPACING)
@@ -141,12 +135,6 @@ SGIView::SGIView(const char* name, uint32 flags, TranslatorSettings* settings)
 	GetFont(&font);
 	SetExplicitPreferredSize(BSize((font.Size() * 390) / 12,
 		(font.Size() * 180) / 12));
-
-	// TODO: remove this workaround for ticket #4217
-	infoView->SetExplicitPreferredSize(
-		BSize(infoView->LineWidth(3), infoView->TextHeight(0, 80)));
-	infoView->SetExplicitMaxSize(infoView->ExplicitPreferredSize());
-	infoView->SetExplicitMinSize(infoView->ExplicitPreferredSize());
 }
 
 

src/kits/interface/StringView.cpp

@@ -22,6 +22,7 @@
 #include <LayoutUtils.h>
 #include <Message.h>
 #include <PropertyInfo.h>
+#include <StringList.h>
 #include <View.h>
 #include <Window.h>
 
@@ -55,7 +56,7 @@ BStringView::BStringView(BRect frame, const char* name, const char* text,
 	fText(text ? strdup(text) : NULL),
 	fTruncation(B_NO_TRUNCATION),
 	fAlign(B_ALIGN_LEFT),
-	fPreferredSize(text ? StringWidth(text) : 0.0, -1)
+	fPreferredSize(text ? _StringWidth(text) : 0.0, -1)
 {
 }
 
@@ -66,7 +67,7 @@ BStringView::BStringView(const char* name, const char* text, uint32 flags)
 	fText(text ? strdup(text) : NULL),
 	fTruncation(B_NO_TRUNCATION),
 	fAlign(B_ALIGN_LEFT),
-	fPreferredSize(text ? StringWidth(text) : 0.0, -1)
+	fPreferredSize(text ? _StringWidth(text) : 0.0, -1)
 {
 }
 
@@ -273,20 +274,24 @@ BStringView::Draw(BRect updateRect)
 
 	BRect bounds = Bounds();
 
-	const char* text = fText;
-	float width = fPreferredSize.width;
+	BStringList lines;
+	BString(fText).Split("\n", false, lines);
+	for (int i = 0; i < lines.CountStrings(); i++) {
+		const char* text = lines.StringAt(i).String();
+		float width = StringWidth(text);
 		BString truncated;
 		if (fTruncation != B_NO_TRUNCATION && width > bounds.Width()) {
 			// The string needs to be truncated
 			// TODO: we should cache this
-		truncated = fText;
+			truncated = lines.StringAt(i);
 			TruncateString(&truncated, fTruncation, bounds.Width());
 			text = truncated.String();
 			width = StringWidth(text);
 		}
 
-	float y = (bounds.top + bounds.bottom - ceilf(fontHeight.ascent)
-		- ceilf(fontHeight.descent)) / 2.0 + ceilf(fontHeight.ascent);
+		float y = (bounds.top + bounds.bottom - ceilf(fontHeight.descent))
+			- ceilf(fontHeight.ascent + fontHeight.descent + fontHeight.leading)
+				* (lines.CountStrings() - i - 1);
 		float x;
 		switch (fAlign) {
 			case B_ALIGN_RIGHT:
@@ -303,6 +308,7 @@ BStringView::Draw(BRect updateRect)
 		}
 
 		DrawString(text, BPoint(x, y));
+	}
 }
 
 
@@ -391,7 +397,7 @@ BStringView::SetText(const char* text)
 	free(fText);
 	fText = text ? strdup(text) : NULL;
 
-	float newStringWidth = StringWidth(fText);
+	float newStringWidth = _StringWidth(fText);
 	if (fPreferredSize.width != newStringWidth) {
 		fPreferredSize.width = newStringWidth;
 		InvalidateLayout();
@@ -476,7 +482,7 @@ BStringView::SetFont(const BFont* font, uint32 mask)
 {
 	BView::SetFont(font, mask);
 
-	fPreferredSize.width = StringWidth(fText);
+	fPreferredSize.width = _StringWidth(fText);
 
 	Invalidate();
 	InvalidateLayout();
@@ -585,8 +591,15 @@ BStringView::_ValidatePreferredSize()
 		font_height fontHeight;
 		GetFontHeight(&fontHeight);
 
+		int32 lines = 0;
+		char* temp = fText;
+		do {
+			temp = strchr(temp + 1, '\n');
+			lines++;
+		} while (temp != NULL);
+
 		fPreferredSize.height = ceilf(fontHeight.ascent + fontHeight.descent
-			+ fontHeight.leading);
+			+ fontHeight.leading) * lines;
 
 		ResetLayoutInvalidation();
 	}
@@ -595,6 +608,24 @@ BStringView::_ValidatePreferredSize()
 }
 
 
+float
+BStringView::_StringWidth(const char* text)
+{
+	if(text == NULL)
+		return 0.0f;
+
+	float maxWidth = 0.0f;
+	BStringList lines;
+	BString(fText).Split("\n", false, lines);
+	for (int i = 0; i < lines.CountStrings(); i++) {
+		float width = StringWidth(lines.StringAt(i));
+		if (maxWidth < width)
+			maxWidth = width;
+	}
+	return maxWidth;
+}
+
+
 extern "C" void
 B_IF_GCC_2(InvalidateLayout__11BStringViewb,
 	_ZN11BStringView16InvalidateLayoutEb)(BView* view, bool descendants)