(svn r25816) -Add [FS#5748]: Toggle button for wrapping lines in the textfile GUI (LordAro)

7 files changed, 80 insertions, 32 deletions

diff --git a/src/gfx.cpp b/src/gfx.cpp
index 3fabf0b09..aa81f99f8 100644
--- a/src/gfx.cpp
+++ b/src/gfx.cpp
@@ -535,9 +535,9 @@ int DrawString(int left, int right, int top, StringID str, TextColour colour, St
  * @param maxw maximum string width
  * @return height of pixels of string when it is drawn
  */
-static int GetStringHeight(const char *str, int maxw)
+int GetStringHeight(const char *str, int maxw, FontSize fontsize)
 {
-	Layouter layout(str, maxw);
+	Layouter layout(str, maxw, TC_FROMSTRING, fontsize);
 	return layout.GetBounds().height;
 }
 
diff --git a/src/gfx_func.h b/src/gfx_func.h
index aa18f3f70..709fc2cc9 100644
--- a/src/gfx_func.h
+++ b/src/gfx_func.h
@@ -123,6 +123,7 @@ void DrawBox(int x, int y, int dx1, int dy1, int dx2, int dy2, int dx3, int dy3)
 
 Dimension GetStringBoundingBox(const char *str, FontSize start_fontsize = FS_NORMAL);
 Dimension GetStringBoundingBox(StringID strid);
+int GetStringHeight(const char *str, int maxw, FontSize fontsize = FS_NORMAL);
 int GetStringHeight(StringID str, int maxw);
 int GetStringLineCount(StringID str, int maxw);
 Dimension GetStringMultiLineBoundingBox(StringID str, const Dimension &suggestion);
diff --git a/src/lang/english.txt b/src/lang/english.txt
index ad0cac3fe..013d979d5 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -3941,6 +3941,8 @@ STR_AI_SETTINGS_START_DELAY                                     :Number of days
 STR_TEXTFILE_README_CAPTION                                     :{WHITE}{STRING} readme of {RAW_STRING}
 STR_TEXTFILE_CHANGELOG_CAPTION                                  :{WHITE}{STRING} changelog of {RAW_STRING}
 STR_TEXTFILE_LICENCE_CAPTION                                    :{WHITE}{STRING} licence of {RAW_STRING}
+STR_TEXTFILE_WRAP_TEXT                                          :{WHITE}Wrap text
+STR_TEXTFILE_WRAP_TEXT_TOOLTIP                                  :{BLACK}Wrap the text of the window so it all fits without having to scroll
 STR_TEXTFILE_VIEW_README                                        :{BLACK}View readme
 STR_TEXTFILE_VIEW_CHANGELOG                                     :{BLACK}Changelog
 STR_TEXTFILE_VIEW_LICENCE                                       :{BLACK}Licence
diff --git a/src/script/api/script_window.hpp b/src/script/api/script_window.hpp
index 391d3a4e4..5335af1b7 100644
--- a/src/script/api/script_window.hpp
+++ b/src/script/api/script_window.hpp
@@ -1558,6 +1558,7 @@ public:
 	/** Widgets of the #TextfileWindow class. */
 	enum TextfileWidgets {
 		WID_TF_CAPTION                               = ::WID_TF_CAPTION,                               ///< The caption of the window.
+		WID_TF_WRAPTEXT                              = ::WID_TF_WRAPTEXT,                              ///< Whether or not to wrap the text.
 		WID_TF_BACKGROUND                            = ::WID_TF_BACKGROUND,                            ///< Panel to draw the textfile on.
 		WID_TF_VSCROLLBAR                            = ::WID_TF_VSCROLLBAR,                            ///< Vertical scrollbar to scroll through the textfile up-and-down.
 		WID_TF_HSCROLLBAR                            = ::WID_TF_HSCROLLBAR,                            ///< Horizontal scrollbar to scroll through the textfile left-to-right.
diff --git a/src/textfile_gui.cpp b/src/textfile_gui.cpp
index 987fa09cd..05c534c59 100644
--- a/src/textfile_gui.cpp
+++ b/src/textfile_gui.cpp
@@ -21,12 +21,12 @@
 
 #include "table/strings.h"
 
-
 /** Widgets for the textfile window. */
 static const NWidgetPart _nested_textfile_widgets[] = {
 	NWidget(NWID_HORIZONTAL),
 		NWidget(WWT_CLOSEBOX, COLOUR_MAUVE),
 		NWidget(WWT_CAPTION, COLOUR_MAUVE, WID_TF_CAPTION), SetDataTip(STR_NULL, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
+		NWidget(WWT_TEXTBTN, COLOUR_MAUVE, WID_TF_WRAPTEXT), SetDataTip(STR_TEXTFILE_WRAP_TEXT, STR_TEXTFILE_WRAP_TEXT_TOOLTIP),
 		NWidget(WWT_DEFSIZEBOX, COLOUR_MAUVE),
 	EndContainer(),
 	NWidget(NWID_HORIZONTAL),
@@ -57,6 +57,9 @@ TextfileWindow::TextfileWindow(TextfileType file_type) : Window(&_textfile_desc)
 	this->hscroll = this->GetScrollbar(WID_TF_HSCROLLBAR);
 	this->FinishInitNested();
 	this->GetWidget<NWidgetCore>(WID_TF_CAPTION)->SetDataTip(STR_TEXTFILE_README_CAPTION + file_type, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS);
+
+	this->hscroll->SetStepSize(10); // Speed up horizontal scrollbar
+	this->vscroll->SetStepSize(FONT_HEIGHT_MONO);
 }
 
 /* virtual */ TextfileWindow::~TextfileWindow()
@@ -64,12 +67,27 @@ TextfileWindow::TextfileWindow(TextfileType file_type) : Window(&_textfile_desc)
 	free(this->text);
 }
 
+/**
+ * Get the total height of the content displayed in this window, if wrapping is disabled.
+ * @return the height in pixels
+ */
+uint TextfileWindow::GetContentHeight()
+{
+	int max_width = this->GetWidget<NWidgetCore>(WID_TF_BACKGROUND)->current_x - WD_FRAMETEXT_LEFT - WD_FRAMERECT_RIGHT;
+
+	uint height = 0;
+	for (uint i = 0; i < this->lines.Length(); i++) {
+		height += GetStringHeight(this->lines[i], max_width, FS_MONO);
+	}
+
+	return height;
+}
+
 /* virtual */ void TextfileWindow::UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
 {
 	switch (widget) {
 		case WID_TF_BACKGROUND:
-			this->line_height = FONT_HEIGHT_MONO + 2;
-			resize->height = this->line_height;
+			resize->height = 1;
 
 			size->height = 4 * resize->height + TOP_SPACING + BOTTOM_SPACING; // At least 4 lines are visible.
 			size->width = max(200u, size->width); // At least 200 pixels wide.
@@ -77,29 +95,60 @@ TextfileWindow::TextfileWindow(TextfileType file_type) : Window(&_textfile_desc)
 	}
 }
 
+/** Set scrollbars to the right lengths. */
+void TextfileWindow::SetupScrollbars()
+{
+	if (IsWidgetLowered(WID_TF_WRAPTEXT)) {
+		this->vscroll->SetCount(this->GetContentHeight());
+		this->hscroll->SetCount(0);
+	} else {
+		uint max_length = 0;
+		for (uint i = 0; i < this->lines.Length(); i++) {
+			max_length = max(max_length, GetStringBoundingBox(this->lines[i], FS_MONO).width);
+		}
+		this->vscroll->SetCount(this->lines.Length() * FONT_HEIGHT_MONO);
+		this->hscroll->SetCount(max_length + WD_FRAMETEXT_LEFT + WD_FRAMETEXT_RIGHT);
+	}
+
+	this->SetWidgetDisabledState(WID_TF_HSCROLLBAR, IsWidgetLowered(WID_TF_WRAPTEXT));
+}
+
+/* virtual */ void TextfileWindow::OnClick(Point pt, int widget, int click_count)
+{
+	switch (widget) {
+		case WID_TF_WRAPTEXT:
+			this->ToggleWidgetLoweredState(WID_TF_WRAPTEXT);
+			this->SetupScrollbars();
+			this->InvalidateData();
+			break;
+	}
+}
+
 /* virtual */ void TextfileWindow::DrawWidget(const Rect &r, int widget) const
 {
 	if (widget != WID_TF_BACKGROUND) return;
 
-	int width = r.right - r.left + 1 - WD_BEVEL_LEFT - WD_BEVEL_RIGHT;
-	int height = r.bottom - r.top + 1 - WD_BEVEL_LEFT - WD_BEVEL_RIGHT;
+	const int x = r.left + WD_FRAMETEXT_LEFT;
+	const int y = r.top + WD_FRAMETEXT_TOP;
+	const int right = r.right - WD_FRAMETEXT_RIGHT;
+	const int bottom = r.bottom - WD_FRAMETEXT_BOTTOM;
 
 	DrawPixelInfo new_dpi;
-	if (!FillDrawPixelInfo(&new_dpi, r.left + WD_BEVEL_LEFT, r.top, width, height)) return;
+	if (!FillDrawPixelInfo(&new_dpi, x, y, right - x + 1, r.bottom - y + 1)) return;
 	DrawPixelInfo *old_dpi = _cur_dpi;
 	_cur_dpi = &new_dpi;
 
-	int left, right;
-	if (_current_text_dir == TD_RTL) {
-		left = width + WD_BEVEL_RIGHT - WD_FRAMETEXT_RIGHT - this->hscroll->GetCount();
-		right = width + WD_BEVEL_RIGHT - WD_FRAMETEXT_RIGHT - 1 + this->hscroll->GetPosition();
-	} else {
-		left = WD_FRAMETEXT_LEFT - WD_BEVEL_LEFT - this->hscroll->GetPosition();
-		right = WD_FRAMETEXT_LEFT - WD_BEVEL_LEFT + this->hscroll->GetCount() - 1;
-	}
-	int top = TOP_SPACING;
-	for (uint i = 0; i < this->vscroll->GetCapacity() && i + this->vscroll->GetPosition() < this->lines.Length(); i++) {
-		DrawString(left, right, top + i * this->line_height, this->lines[i + this->vscroll->GetPosition()], TC_WHITE, SA_LEFT, false, FS_MONO);
+	/* Draw content (now coordinates given to DrawString* are local to the new clipping region). */
+	int line_height = FONT_HEIGHT_MONO;
+	int y_offset = -this->vscroll->GetPosition();
+
+	for (uint i = 0; i < this->lines.Length(); i++) {
+		if (IsWidgetLowered(WID_TF_WRAPTEXT)) {
+			y_offset = DrawStringMultiLine(0, right - x, y_offset, bottom - y, this->lines[i], TC_WHITE, SA_TOP | SA_LEFT, false, FS_MONO);
+		} else {
+			DrawString(-this->hscroll->GetPosition(), right - x, y_offset, this->lines[i], TC_WHITE, SA_TOP | SA_LEFT, false, FS_MONO);
+			y_offset += line_height; // margin to previous element
+		}
 	}
 
 	_cur_dpi = old_dpi;
@@ -109,6 +158,8 @@ TextfileWindow::TextfileWindow(TextfileType file_type) : Window(&_textfile_desc)
 {
 	this->vscroll->SetCapacityFromWidget(this, WID_TF_BACKGROUND, TOP_SPACING + BOTTOM_SPACING);
 	this->hscroll->SetCapacityFromWidget(this, WID_TF_BACKGROUND);
+
+	this->SetupScrollbars();
 }
 
 /* virtual */ void TextfileWindow::Reset()
@@ -141,7 +192,7 @@ TextfileWindow::TextfileWindow(TextfileType file_type) : Window(&_textfile_desc)
 }
 
 /**
- * Loads the textfile text from file, and setup #lines, #max_length, and both scrollbars.
+ * Loads the textfile text from file and setup #lines.
  */
 /* virtual */ void TextfileWindow::LoadTextfile(const char *textfile, Subdirectory dir)
 {
@@ -183,16 +234,6 @@ TextfileWindow::TextfileWindow(TextfileType file_type) : Window(&_textfile_desc)
 	}
 
 	CheckForMissingGlyphs(true, this);
-
-	/* Initialize scrollbars */
-	this->vscroll->SetCount(this->lines.Length());
-
-	this->max_length = 0;
-	for (uint i = 0; i < this->lines.Length(); i++) {
-		this->max_length = max(this->max_length, GetStringBoundingBox(this->lines[i], FS_MONO).width);
-	}
-	this->hscroll->SetCount(this->max_length + WD_FRAMETEXT_LEFT + WD_FRAMETEXT_RIGHT);
-	this->hscroll->SetStepSize(10); // Speed up horizontal scrollbar
 }
 
 /**
diff --git a/src/textfile_gui.h b/src/textfile_gui.h
index a2d2af8f9..9495fa3f0 100644
--- a/src/textfile_gui.h
+++ b/src/textfile_gui.h
@@ -22,12 +22,10 @@ const char *GetTextfile(TextfileType type, Subdirectory dir, const char *filenam
 /** Window for displaying a textfile */
 struct TextfileWindow : public Window, MissingGlyphSearcher {
 	TextfileType file_type;              ///< Type of textfile to view.
-	int line_height;                     ///< Height of a line in the display widget.
 	Scrollbar *vscroll;                  ///< Vertical scrollbar.
 	Scrollbar *hscroll;                  ///< Horizontal scrollbar.
 	char *text;                          ///< Lines of text from the NewGRF's textfile.
 	SmallVector<const char *, 64> lines; ///< #text, split into lines in a table with lines.
-	uint max_length;                     ///< The longest line in the textfile (in pixels).
 	uint search_iterator;                ///< Iterator for the font check search.
 
 	static const int TOP_SPACING    = WD_FRAMETEXT_TOP;    ///< Additional spacing at the top of the #WID_TF_BACKGROUND widget.
@@ -36,6 +34,7 @@ struct TextfileWindow : public Window, MissingGlyphSearcher {
 	TextfileWindow(TextfileType file_type);
 	virtual ~TextfileWindow();
 	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize);
+	virtual void OnClick(Point pt, int widget, int click_count);
 	virtual void DrawWidget(const Rect &r, int widget) const;
 	virtual void OnResize();
 	virtual void Reset();
@@ -44,6 +43,9 @@ struct TextfileWindow : public Window, MissingGlyphSearcher {
 	virtual bool Monospace();
 	virtual void SetFontNames(FreeTypeSettings *settings, const char *font_name);
 	virtual void LoadTextfile(const char *textfile, Subdirectory dir);
+private:
+	uint GetContentHeight();
+	void SetupScrollbars();
 };
 
 #endif /* TEXTFILE_GUI_H */
diff --git a/src/widgets/misc_widget.h b/src/widgets/misc_widget.h
index a54e83035..a6dd081a9 100644
--- a/src/widgets/misc_widget.h
+++ b/src/widgets/misc_widget.h
@@ -48,6 +48,7 @@ enum QueryWidgets {
 /** Widgets of the #TextfileWindow class. */
 enum TextfileWidgets {
 	WID_TF_CAPTION,    ///< The caption of the window.
+	WID_TF_WRAPTEXT,   ///< Whether or not to wrap the text.
 	WID_TF_BACKGROUND, ///< Panel to draw the textfile on.
 	WID_TF_VSCROLLBAR, ///< Vertical scrollbar to scroll through the textfile up-and-down.
 	WID_TF_HSCROLLBAR, ///< Horizontal scrollbar to scroll through the textfile left-to-right.