Allow Magnify to resize to smaller sizes more gracefully.

Fixes ticket #4146

Signed-off-by: Matt Madia <mattmadia@gmail.com>

src/apps/magnify/Magnify.cpp

@@ -222,6 +222,7 @@ TWindow::TWindow(int32 pixelCount)
 	fInfo->SetMagView(fFatBits);
 
 	ResizeWindow(fHPixelCount, fVPixelCount);
+	UpdateInfoBarOnResize();
 
 	AddShortcut('S', B_COMMAND_KEY, new BMessage(msg_save));
 	AddShortcut('C', B_COMMAND_KEY, new BMessage(msg_copy_image));
@@ -251,8 +252,10 @@ TWindow::MessageReceived(BMessage* m)
 
 	switch (m->what) {
 		case msg_show_info:
-			if (active)
+			if (active) {
+				fInfoBarState = !fInfoBarState;
 				ShowInfo(!fShowInfo);
+			}
 			break;
 
 		case msg_toggle_grid:
@@ -440,6 +443,7 @@ ALMOST_DONE:	//	clean up and try to position the window
 DONE:
 	fShowGrid = showGrid;
 	fShowInfo = showInfo;
+	fInfoBarState = showInfo;
 	fHPixelCount = (overridePixelCount == -1) ? hPixelCount : overridePixelCount;
 	fVPixelCount = (overridePixelCount == -1) ? vPixelCount : overridePixelCount;
 	fPixelSize = pixelSize;
@@ -487,6 +491,7 @@ TWindow::FrameResized(float w, float h)
 {
 	CalcViewablePixels();
 	fFatBits->InitBuffers(fHPixelCount, fVPixelCount, fPixelSize, ShowGrid());
+	UpdateInfoBarOnResize();
 }
 
 
@@ -633,6 +638,7 @@ TWindow::ShowInfo(bool i)
 
 	fFatBits->SetSelection(fShowInfo);
 	ResizeWindow(fHPixelCount, fVPixelCount);
+	fInfo->SetInfoTextVisible(i);
 }
 
 
@@ -650,6 +656,21 @@ TWindow::UpdateInfo()
 }
 
 
+void
+TWindow::UpdateInfoBarOnResize()
+{
+	float infoWidth, infoHeight;
+	fInfo->GetPreferredSize(&infoWidth, &infoHeight);
+
+	if (infoWidth > Bounds().Width() ||
+		infoHeight > Bounds().Height()) {
+		ShowInfo(false);
+	} else {
+		ShowInfo(true);
+	}
+}
+
+
 void
 TWindow::AddCrossHair()
 {
@@ -771,6 +792,8 @@ TInfoView::TInfoView(BRect frame)
 	fRGBStr[0] = 0;
 	fCH1Str[0] = 0;
 	fCH2Str[0] = 0;
+
+	fInfoTextVisible = true;
 }
 
 
@@ -821,7 +844,9 @@ TInfoView::Draw(BRect updateRect)
 	FillRect(invalRect);
 	SetHighColor(ui_color(B_PANEL_TEXT_COLOR));
 	strcpy(fInfoStr, dimensionsInfo);
-	DrawString(fInfoStr);
+	if (fInfoTextVisible) {
+		DrawString(fInfoStr);
+	}
 
 	rgb_color color = { 0, 0, 0, 255 };
 	if (fMagView)
@@ -836,7 +861,9 @@ TInfoView::Draw(BRect updateRect)
 	FillRect(invalRect);
 	SetHighColor(ui_color(B_PANEL_TEXT_COLOR));
 	strcpy(fRGBStr,str);
-	DrawString(fRGBStr);
+	if (fInfoTextVisible) {
+		DrawString(fRGBStr);
+	}
 
 	bool ch1Showing, ch2Showing;
 	dynamic_cast<TWindow*>(Window())->CrossHairsShowing(&ch1Showing, &ch2Showing);
@@ -855,7 +882,9 @@ TInfoView::Draw(BRect updateRect)
 			FillRect(invalRect);
 			SetHighColor(ui_color(B_PANEL_TEXT_COLOR));
 			strcpy(fCH2Str,str);
-			DrawString(fCH2Str);
+			if (fInfoTextVisible) {
+				DrawString(fCH2Str);
+			}
 		}
 
 		if (ch1Showing && ch2Showing) {
@@ -867,7 +896,9 @@ TInfoView::Draw(BRect updateRect)
 			FillRect(invalRect);
 			SetHighColor(ui_color(B_PANEL_TEXT_COLOR));
 			strcpy(fCH1Str,str);
-			DrawString(fCH1Str);
+			if (fInfoTextVisible) {
+				DrawString(fCH1Str);
+			}
 		} else if (ch1Showing) {
 			MovePenTo(10, h-10);
 			sprintf(str, "x: %li  y: %li", (int32)pt1.x, (int32)pt1.y);
@@ -876,7 +907,9 @@ TInfoView::Draw(BRect updateRect)
 			FillRect(invalRect);
 			SetHighColor(ui_color(B_PANEL_TEXT_COLOR));
 			strcpy(fCH1Str,str);
-			DrawString(fCH1Str);
+			if (fInfoTextVisible) {
+				DrawString(fCH1Str);
+			}
 		}
 	}
 
@@ -965,6 +998,39 @@ TMenu::AttachedToWindow()
 }
 
 
+void
+TInfoView::GetPreferredSize(float* _width, float* _height)
+{
+	if(_width) {
+		float str1Width = StringWidth(fCH1Str)
+			+ StringWidth(fCH2Str)
+			+ StringWidth(fRGBStr)
+			+ 30;
+		float str2Width = StringWidth(fInfoStr) + 30;
+		*_width = str1Width > str2Width ? str1Width : str2Width;
+	}
+
+	if(_height) {
+		*_height = fFontHeight * 2 + 10;
+	}
+}
+
+
+bool
+TInfoView::isInfoTextVisible()
+{
+	return fInfoTextVisible;
+}
+
+
+void
+TInfoView::SetInfoTextVisible(bool visible)
+{
+	fInfoTextVisible = visible;
+	Draw(Bounds());
+}
+
+
 //	#pragma mark -
 
 

src/apps/magnify/Magnify.h

@@ -165,9 +165,12 @@ class TInfoView : public BBox {
 		virtual void	AttachedToWindow();
 		virtual void	Draw(BRect updateRect);
 		virtual void	FrameResized(float width, float height);
+		virtual void	GetPreferredSize(float* _width, float* height);
 
 		void			AddMenu();
 		void			SetMagView(TMagnify* magView);
+		void			SetInfoTextVisible(bool visible);
+		bool			isInfoTextVisible();
 
 	private:
 		float	 		fFontHeight;
@@ -188,6 +191,8 @@ class TInfoView : public BBox {
 		char			fRGBStr[64];
 		char			fCH1Str[64];
 		char			fCH2Str[64];
+
+		bool			fInfoTextVisible;
 };
 
 class TWindow : public BWindow {
@@ -219,6 +224,7 @@ class TWindow : public BWindow {
 		void			ShowInfo(bool);
 		bool			InfoIsShowing();
 		void			UpdateInfo();
+		void			UpdateInfoBarOnResize();
 
 		void			AddCrossHair();
 		void			RemoveCrossHair();
@@ -238,6 +244,7 @@ class TWindow : public BWindow {
 		float 			fFontHeight;
 
 		bool			fShowGrid;
+		bool			fInfoBarState;
 
 		int32			fHPixelCount;
 		int32			fVPixelCount;