diff options
Diffstat (limited to 'generic/ttk/ttkLabel.c')
| -rw-r--r-- | generic/ttk/ttkLabel.c | 670 |
1 files changed, 670 insertions, 0 deletions
diff --git a/generic/ttk/ttkLabel.c b/generic/ttk/ttkLabel.c new file mode 100644 index 0000000..0f773e7 --- /dev/null +++ b/generic/ttk/ttkLabel.c @@ -0,0 +1,670 @@ +/* + * text, image, and label elements. + * + * The label element combines text and image elements, + * with layout determined by the "-compound" option. + * + */ + +#include <tcl.h> +#include <tk.h> +#include "ttkTheme.h" + +/*---------------------------------------------------------------------- + * +++ Text element. + * + * This element displays a textual label in the foreground color. + * + * Optionally underlines the mnemonic character if the -underline resource + * is present and >= 0. + */ + +typedef struct { + /* + * Element options: + */ + Tcl_Obj *textObj; + Tcl_Obj *fontObj; + Tcl_Obj *foregroundObj; + Tcl_Obj *underlineObj; + Tcl_Obj *widthObj; + Tcl_Obj *anchorObj; + Tcl_Obj *justifyObj; + Tcl_Obj *wrapLengthObj; + Tcl_Obj *embossedObj; + + /* + * Computed resources: + */ + Tk_Font tkfont; + Tk_TextLayout textLayout; + int width; + int height; + int embossed; + +} TextElement; + +/* Text element options table. + * NB: Keep in sync with label element option table. + */ +static Ttk_ElementOptionSpec TextElementOptions[] = { + { "-text", TK_OPTION_STRING, + Tk_Offset(TextElement,textObj), "" }, + { "-font", TK_OPTION_FONT, + Tk_Offset(TextElement,fontObj), DEFAULT_FONT }, + { "-foreground", TK_OPTION_COLOR, + Tk_Offset(TextElement,foregroundObj), "black" }, + { "-underline", TK_OPTION_INT, + Tk_Offset(TextElement,underlineObj), "-1"}, + { "-width", TK_OPTION_INT, + Tk_Offset(TextElement,widthObj), "-1"}, + { "-anchor", TK_OPTION_ANCHOR, + Tk_Offset(TextElement,anchorObj), "w"}, + { "-justify", TK_OPTION_JUSTIFY, + Tk_Offset(TextElement,justifyObj), "left" }, + { "-wraplength", TK_OPTION_PIXELS, + Tk_Offset(TextElement,wrapLengthObj), "0" }, + { "-embossed", TK_OPTION_INT, + Tk_Offset(TextElement,embossedObj), "0"}, + { NULL, 0, 0, NULL } +}; + +static int TextSetup(TextElement *text, Tk_Window tkwin) +{ + const char *string = Tcl_GetString(text->textObj); + Tk_Justify justify = TK_JUSTIFY_LEFT; + int wrapLength = 0; + + text->tkfont = Tk_GetFontFromObj(tkwin, text->fontObj); + Tk_GetJustifyFromObj(NULL, text->justifyObj, &justify); + Tk_GetPixelsFromObj(NULL, tkwin, text->wrapLengthObj, &wrapLength); + Tcl_GetBooleanFromObj(NULL, text->embossedObj, &text->embossed); + + text->textLayout = Tk_ComputeTextLayout( + text->tkfont, string, -1/*numChars*/, wrapLength, justify, + 0/*flags*/, &text->width, &text->height); + + return 1; +} + +/* + * TextReqWidth -- compute the requested width of a text element. + * + * If -width is positive, use that as the width + * If -width is negative, use that as the minimum width + * If not specified or empty, use the natural size of the text + */ + +static int TextReqWidth(TextElement *text) +{ + int reqWidth; + + if ( text->widthObj + && Tcl_GetIntFromObj(NULL, text->widthObj, &reqWidth) == TCL_OK) + { + int avgWidth = Tk_TextWidth(text->tkfont, "0", 1); + if (reqWidth <= 0) { + int specWidth = avgWidth * -reqWidth; + if (specWidth > text->width) + return specWidth; + } else { + return avgWidth * reqWidth; + } + } + return text->width; +} + +static void TextCleanup(TextElement *text) +{ + Tk_FreeTextLayout(text->textLayout); +} + +/* + * TextDraw -- + * Draw a text element. + * Called by TextElementDraw() and LabelElementDraw(). + */ +static void TextDraw(TextElement *text, Tk_Window tkwin, Drawable d, Ttk_Box b) +{ + XColor *color = Tk_GetColorFromObj(tkwin, text->foregroundObj); + int underline = -1; + int lastChar = -1; + XGCValues gcValues; + GC gc1, gc2; + Tk_Anchor anchor = TK_ANCHOR_CENTER; + + gcValues.font = Tk_FontId(text->tkfont); + gcValues.foreground = color->pixel; + gc1 = Tk_GetGC(tkwin, GCFont | GCForeground, &gcValues); + gcValues.foreground = WhitePixelOfScreen(Tk_Screen(tkwin)); + gc2 = Tk_GetGC(tkwin, GCFont | GCForeground, &gcValues); + + /* + * Place text according to -anchor: + */ + Tk_GetAnchorFromObj(NULL, text->anchorObj, &anchor); + b = Ttk_AnchorBox(b, text->width, text->height, anchor); + + /* + * Clip text if it's too wide: + * @@@ BUG: This will overclip multi-line text. + */ + if (b.width < text->width) { + lastChar = Tk_PointToChar(text->textLayout, b.width, 1) + 1; + } + + if (text->embossed) { + Tk_DrawTextLayout(Tk_Display(tkwin), d, gc2, + text->textLayout, b.x+1, b.y+1, 0/*firstChar*/, lastChar); + } + Tk_DrawTextLayout(Tk_Display(tkwin), d, gc1, + text->textLayout, b.x, b.y, 0/*firstChar*/, lastChar); + + Tcl_GetIntFromObj(NULL, text->underlineObj, &underline); + if (underline >= 0 && (lastChar == -1 || underline <= lastChar)) { + if (text->embossed) { + Tk_UnderlineTextLayout(Tk_Display(tkwin), d, gc2, + text->textLayout, b.x+1, b.y+1, underline); + } + Tk_UnderlineTextLayout(Tk_Display(tkwin), d, gc1, + text->textLayout, b.x, b.y, underline); + } + + Tk_FreeGC(Tk_Display(tkwin), gc1); + Tk_FreeGC(Tk_Display(tkwin), gc2); +} + +static void TextElementSize( + void *clientData, void *elementRecord, Tk_Window tkwin, + int *widthPtr, int *heightPtr, Ttk_Padding *paddingPtr) +{ + TextElement *text = elementRecord; + + if (!TextSetup(text, tkwin)) + return; + + *heightPtr = text->height; + *widthPtr = TextReqWidth(text); + + TextCleanup(text); + + return; +} + +static void TextElementDraw( + void *clientData, void *elementRecord, Tk_Window tkwin, + Drawable d, Ttk_Box b, Ttk_State state) +{ + TextElement *text = elementRecord; + if (TextSetup(text, tkwin)) { + TextDraw(text, tkwin, d, b); + TextCleanup(text); + } +} + +static Ttk_ElementSpec TextElementSpec = { + TK_STYLE_VERSION_2, + sizeof(TextElement), + TextElementOptions, + TextElementSize, + TextElementDraw +}; + +/*---------------------------------------------------------------------- + * +++ Image element. + * Draws an image. + */ + +typedef struct { + Tcl_Obj *imageObj; + Tcl_Obj *stippleObj; /* For TTK_STATE_DISABLED */ + Tcl_Obj *backgroundObj; /* " " */ + + Ttk_ImageSpec *imageSpec; + Tk_Image tkimg; + int width; + int height; +} ImageElement; + +/* ===> NB: Keep in sync with label element option table. <=== + */ +static Ttk_ElementOptionSpec ImageElementOptions[] = { + { "-image", TK_OPTION_STRING, + Tk_Offset(ImageElement,imageObj), "" }, + { "-stipple", TK_OPTION_STRING, /* Really: TK_OPTION_BITMAP */ + Tk_Offset(ImageElement,stippleObj), "gray50" }, + { "-background", TK_OPTION_COLOR, + Tk_Offset(ImageElement,backgroundObj), DEFAULT_BACKGROUND }, + { NULL, 0, 0, NULL } +}; + +/* + * ImageSetup() -- + * Look up the Tk_Image from the image element's imageObj resource. + * Caller must release the image with ImageCleanup(). + * + * Returns: + * 1 if successful, 0 if there was an error (unreported) + * or the image resource was not specified. + */ + +static int ImageSetup( + ImageElement *image, Tk_Window tkwin, Ttk_State state) +{ + + if (!image->imageObj) { + return 0; + } + image->imageSpec = TtkGetImageSpec(NULL, tkwin, image->imageObj); + if (!image->imageSpec) { + return 0; + } + image->tkimg = TtkSelectImage(image->imageSpec, state); + if (!image->tkimg) { + TtkFreeImageSpec(image->imageSpec); + return 0; + } + Tk_SizeOfImage(image->tkimg, &image->width, &image->height); + + return 1; +} + +static void ImageCleanup(ImageElement *image) +{ + TtkFreeImageSpec(image->imageSpec); +} + +/* + * StippleOver -- + * Draw a stipple over the image area, to make it look "grayed-out" + * when TTK_STATE_DISABLED is set. + */ +static void StippleOver( + ImageElement *image, Tk_Window tkwin, Drawable d, int x, int y) +{ + Pixmap stipple = Tk_AllocBitmapFromObj(NULL, tkwin, image->stippleObj); + XColor *color = Tk_GetColorFromObj(tkwin, image->backgroundObj); + + if (stipple != None) { + unsigned long mask = GCFillStyle | GCStipple | GCForeground; + XGCValues gcvalues; + GC gc; + gcvalues.foreground = color->pixel; + gcvalues.fill_style = FillStippled; + gcvalues.stipple = stipple; + gc = Tk_GetGC(tkwin, mask, &gcvalues); + XFillRectangle(Tk_Display(tkwin),d,gc,x,y,image->width,image->height); + Tk_FreeGC(Tk_Display(tkwin), gc); + Tk_FreeBitmapFromObj(tkwin, image->stippleObj); + } +} + +static void ImageDraw( + ImageElement *image, Tk_Window tkwin,Drawable d,Ttk_Box b,Ttk_State state) +{ + int width = image->width, height = image->height; + + /* Clip width and height to remain within window bounds: + */ + if (b.x + width > Tk_Width(tkwin)) { + width = Tk_Width(tkwin) - b.x; + } + if (b.y + height > Tk_Height(tkwin)) { + height = Tk_Height(tkwin) - b.y; + } + + if (height <= 0 || width <= 0) { + /* Completely clipped - bail out. + */ + return; + } + + Tk_RedrawImage(image->tkimg, 0,0, width, height, d, b.x, b.y); + + /* If we're disabled there's no state-specific 'disabled' image, + * stipple the image. + * @@@ Possibly: Don't do disabled-stippling at all; + * @@@ it's ugly and out of fashion. + */ + if (state & TTK_STATE_DISABLED) { + if (TtkSelectImage(image->imageSpec, 0ul) == image->tkimg) { + StippleOver(image, tkwin, d, b.x,b.y); + } + } +} + +static void ImageElementSize( + void *clientData, void *elementRecord, Tk_Window tkwin, + int *widthPtr, int *heightPtr, Ttk_Padding *paddingPtr) +{ + ImageElement *image = elementRecord; + + if (ImageSetup(image, tkwin, 0)) { + *widthPtr = image->width; + *heightPtr = image->height; + ImageCleanup(image); + } +} + +static void ImageElementDraw( + void *clientData, void *elementRecord, Tk_Window tkwin, + Drawable d, Ttk_Box b, Ttk_State state) +{ + ImageElement *image = elementRecord; + + if (ImageSetup(image, tkwin, state)) { + ImageDraw(image, tkwin, d, b, state); + ImageCleanup(image); + } +} + +static Ttk_ElementSpec ImageElementSpec = { + TK_STYLE_VERSION_2, + sizeof(ImageElement), + ImageElementOptions, + ImageElementSize, + ImageElementDraw +}; + +/*------------------------------------------------------------------------ + * +++ Label element. + * + * Displays an image and/or text, as determined by the -compound option. + * + * Differences from Tk 8.4 compound elements: + * + * This adds two new values for the -compound option, "text" + * and "image". (This is useful for configuring toolbars to + * display icons, text and icons, or text only, as found in + * many browsers.) + * + * "-compound none" is supported, but I'd like to get rid of it; + * it makes the logic more complex, and the only benefit is + * backwards compatibility with Tk < 8.3.0 scripts. + * + * This adds a new resource, -space, for determining how much + * space to leave between the text and image; Tk 8.4 reuses the + * -padx or -pady option for this purpose. + * + * -width always specifies the length in characters of the text part; + * in Tk 8.4 it's either characters or pixels, depending on the + * value of -compound. + * + * Negative values of -width are interpreted as a minimum width + * on all platforms, not just on Windows. + * + * Tk 8.4 ignores -padx and -pady if -compound is set to "none". + * Here, padding is handled by a different element. + */ + +typedef struct { + /* + * Element options: + */ + Tcl_Obj *compoundObj; + Tcl_Obj *spaceObj; + TextElement text; + ImageElement image; + + /* + * Computed values (see LabelSetup) + */ + Ttk_Compound compound; + int space; + int totalWidth, totalHeight; +} LabelElement; + +static Ttk_ElementOptionSpec LabelElementOptions[] = { + { "-compound", TK_OPTION_ANY, + Tk_Offset(LabelElement,compoundObj), "none" }, + { "-space", TK_OPTION_PIXELS, + Tk_Offset(LabelElement,spaceObj), "4" }, + + /* Text element part: + * NB: Keep in sync with TextElementOptions. + */ + { "-text", TK_OPTION_STRING, + Tk_Offset(LabelElement,text.textObj), "" }, + { "-font", TK_OPTION_FONT, + Tk_Offset(LabelElement,text.fontObj), DEFAULT_FONT }, + { "-foreground", TK_OPTION_COLOR, + Tk_Offset(LabelElement,text.foregroundObj), "black" }, + { "-underline", TK_OPTION_INT, + Tk_Offset(LabelElement,text.underlineObj), "-1"}, + { "-width", TK_OPTION_INT, + Tk_Offset(LabelElement,text.widthObj), ""}, + { "-anchor", TK_OPTION_ANCHOR, + Tk_Offset(LabelElement,text.anchorObj), "w"}, + { "-justify", TK_OPTION_JUSTIFY, + Tk_Offset(LabelElement,text.justifyObj), "left" }, + { "-wraplength", TK_OPTION_PIXELS, + Tk_Offset(LabelElement,text.wrapLengthObj), "0" }, + { "-embossed", TK_OPTION_INT, + Tk_Offset(LabelElement,text.embossedObj), "0"}, + + /* Image element part: + * NB: Keep in sync with ImageElementOptions. + */ + { "-image", TK_OPTION_STRING, + Tk_Offset(LabelElement,image.imageObj), "" }, + { "-stipple", TK_OPTION_STRING, /* Really: TK_OPTION_BITMAP */ + Tk_Offset(LabelElement,image.stippleObj), "gray50" }, + { "-background", TK_OPTION_COLOR, + Tk_Offset(LabelElement,image.backgroundObj), DEFAULT_BACKGROUND }, + { NULL, 0, 0, NULL } +}; + +/* + * LabelSetup -- + * Fills in computed fields of the label element. + * + * Calculate the text, image, and total width and height. + */ + +#define MAX(a,b) ((a) > (b) ? a : b); +static void LabelSetup( + LabelElement *c, Tk_Window tkwin, Ttk_State state) +{ + Ttk_Compound *compoundPtr = &c->compound; + + Tk_GetPixelsFromObj(NULL,tkwin,c->spaceObj,&c->space); + Ttk_GetCompoundFromObj(NULL,c->compoundObj,(int*)compoundPtr); + + /* + * Deal with TTK_COMPOUND_NONE. + */ + if (c->compound == TTK_COMPOUND_NONE) { + if (ImageSetup(&c->image, tkwin, state)) { + c->compound = TTK_COMPOUND_IMAGE; + } else { + c->compound = TTK_COMPOUND_TEXT; + } + } else if (c->compound != TTK_COMPOUND_TEXT) { + if (!ImageSetup(&c->image, tkwin, state)) { + c->compound = TTK_COMPOUND_TEXT; + } + } + if (c->compound != TTK_COMPOUND_IMAGE) + TextSetup(&c->text, tkwin); + + /* + * ASSERT: + * if c->compound != IMAGE, then TextSetup() has been called + * if c->compound != TEXT, then ImageSetup() has returned successfully + * c->compound != COMPOUND_NONE. + */ + + switch (c->compound) + { + case TTK_COMPOUND_NONE: + /* Can't happen */ + break; + case TTK_COMPOUND_TEXT: + c->totalWidth = c->text.width; + c->totalHeight = c->text.height; + break; + case TTK_COMPOUND_IMAGE: + c->totalWidth = c->image.width; + c->totalHeight = c->image.height; + break; + case TTK_COMPOUND_CENTER: + c->totalWidth = MAX(c->image.width, c->text.width); + c->totalHeight = MAX(c->image.height, c->text.height); + break; + case TTK_COMPOUND_TOP: + case TTK_COMPOUND_BOTTOM: + c->totalWidth = MAX(c->image.width, c->text.width); + c->totalHeight = c->image.height + c->text.height + c->space; + break; + + case TTK_COMPOUND_LEFT: + case TTK_COMPOUND_RIGHT: + c->totalWidth = c->image.width + c->text.width + c->space; + c->totalHeight = MAX(c->image.height, c->text.height); + break; + } +} + +static void LabelCleanup(LabelElement *c) +{ + if (c->compound != TTK_COMPOUND_TEXT) + ImageCleanup(&c->image); + if (c->compound != TTK_COMPOUND_IMAGE) + TextCleanup(&c->text); +} + +static void LabelElementSize( + void *clientData, void *elementRecord, Tk_Window tkwin, + int *widthPtr, int *heightPtr, Ttk_Padding *paddingPtr) +{ + LabelElement *label = elementRecord; + int textReqWidth = 0; + + LabelSetup(label, tkwin, 0); + + *heightPtr = label->totalHeight; + + /* Requested width based on -width option, not actual text width: + */ + if (label->compound != TTK_COMPOUND_IMAGE) + textReqWidth = TextReqWidth(&label->text); + + switch (label->compound) + { + case TTK_COMPOUND_TEXT: + *widthPtr = textReqWidth; + break; + case TTK_COMPOUND_IMAGE: + *widthPtr = label->image.width; + break; + case TTK_COMPOUND_TOP: + case TTK_COMPOUND_BOTTOM: + case TTK_COMPOUND_CENTER: + *widthPtr = MAX(label->image.width, textReqWidth); + break; + case TTK_COMPOUND_LEFT: + case TTK_COMPOUND_RIGHT: + *widthPtr = label->image.width + textReqWidth + label->space; + break; + case TTK_COMPOUND_NONE: + break; /* Can't happen */ + } + + LabelCleanup(label); +} + +/* + * DrawCompound -- + * Helper routine for LabelElementDraw; + * Handles layout for -compound {left,right,top,bottom} + */ +static void DrawCompound( + LabelElement *l, Ttk_Box b, Tk_Window tkwin, Drawable d, Ttk_State state, + int imageSide, int textSide) +{ + Ttk_Box imageBox = + Ttk_PlaceBox(&b, l->image.width, l->image.height, imageSide, 0); + Ttk_Box textBox = + Ttk_PlaceBox(&b, l->text.width, l->text.height, textSide, 0); + ImageDraw(&l->image,tkwin,d,imageBox,state); + TextDraw(&l->text,tkwin,d,textBox); +} + +static void LabelElementDraw( + void *clientData, void *elementRecord, Tk_Window tkwin, + Drawable d, Ttk_Box b, Ttk_State state) +{ + LabelElement *l = elementRecord; + Tk_Anchor anchor = TK_ANCHOR_CENTER; + + LabelSetup(l, tkwin, state); + + /* + * Adjust overall parcel based on -anchor: + */ + Tk_GetAnchorFromObj(NULL, l->text.anchorObj, &anchor); + b = Ttk_AnchorBox(b, l->totalWidth, l->totalHeight, anchor); + + /* + * Draw text and/or image parts based on -compound: + */ + switch (l->compound) + { + case TTK_COMPOUND_NONE: + /* Can't happen */ + break; + case TTK_COMPOUND_TEXT: + TextDraw(&l->text,tkwin,d,b); + break; + case TTK_COMPOUND_IMAGE: + ImageDraw(&l->image,tkwin,d,b,state); + break; + case TTK_COMPOUND_CENTER: + { + Ttk_Box pb = Ttk_AnchorBox( + b, l->image.width, l->image.height, TK_ANCHOR_CENTER); + ImageDraw(&l->image, tkwin, d, pb, state); + pb = Ttk_AnchorBox( + b, l->text.width, l->text.height, TK_ANCHOR_CENTER); + TextDraw(&l->text, tkwin, d, pb); + break; + } + case TTK_COMPOUND_TOP: + DrawCompound(l, b, tkwin, d, state, TTK_SIDE_TOP, TTK_SIDE_BOTTOM); + break; + case TTK_COMPOUND_BOTTOM: + DrawCompound(l, b, tkwin, d, state, TTK_SIDE_BOTTOM, TTK_SIDE_TOP); + break; + case TTK_COMPOUND_LEFT: + DrawCompound(l, b, tkwin, d, state, TTK_SIDE_LEFT, TTK_SIDE_RIGHT); + break; + case TTK_COMPOUND_RIGHT: + DrawCompound(l, b, tkwin, d, state, TTK_SIDE_RIGHT, TTK_SIDE_LEFT); + break; + } + + LabelCleanup(l); +} + +static Ttk_ElementSpec LabelElementSpec = { + TK_STYLE_VERSION_2, + sizeof(LabelElement), + LabelElementOptions, + LabelElementSize, + LabelElementDraw +}; + +/*------------------------------------------------------------------------ + * +++ Initialization. + */ + +MODULE_SCOPE +void TtkLabel_Init(Tcl_Interp *interp) +{ + Ttk_Theme theme = Ttk_GetDefaultTheme(interp); + + Ttk_RegisterElement(interp, theme, "text", &TextElementSpec, NULL); + Ttk_RegisterElement(interp, theme, "image", &ImageElementSpec, NULL); + Ttk_RegisterElement(interp, theme, "label", &LabelElementSpec, NULL); +} + |