tkwinbutton.c

linux系统下的音频通信

     * In order to avoid screen flashes, this procedure redraws
     * the button in a pixmap, then copies the pixmap to the
     * screen in a single operation.  This means that there's no
     * point in time where the on-sreen image has been cleared.
     */

    pixmap = Tk_GetPixmap(butPtr->display, Tk_WindowId(tkwin),
	    Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
    Tk_Fill3DRectangle(tkwin, pixmap, border, 0, 0, Tk_Width(tkwin),
	    Tk_Height(tkwin), 0, TK_RELIEF_FLAT);

    /*
     * Display image or bitmap or text for button.
     */

    if (butPtr->image != None) {
	Tk_SizeOfImage(butPtr->image, &width, &height);

	imageOrBitmap:
	TkComputeAnchor(butPtr->anchor, tkwin, 0, 0,
		butPtr->indicatorSpace + width, height, &x, &y);
	x += butPtr->indicatorSpace;

	if (relief == TK_RELIEF_SUNKEN) {
	    x += offset;
	    y += offset;
	}
	if (butPtr->image != NULL) {
	    if ((butPtr->selectImage != NULL) && (butPtr->flags & SELECTED)) {
		Tk_RedrawImage(butPtr->selectImage, 0, 0, width, height,
			pixmap, x, y);
	    } else {
		Tk_RedrawImage(butPtr->image, 0, 0, width, height, pixmap,
			x, y);
	    }
	} else {
	    XSetClipOrigin(butPtr->display, gc, x, y);
	    XCopyPlane(butPtr->display, butPtr->bitmap, pixmap, gc, 0, 0,
		    (unsigned int) width, (unsigned int) height, x, y, 1);
	    XSetClipOrigin(butPtr->display, gc, 0, 0);
	}
	y += height/2;
    } else if (butPtr->bitmap != None) {
	Tk_SizeOfBitmap(butPtr->display, butPtr->bitmap, &width, &height);
	goto imageOrBitmap;
    } else {
	RECT rect;
	TkComputeAnchor(butPtr->anchor, tkwin, butPtr->padX, butPtr->padY,
		butPtr->indicatorSpace + butPtr->textWidth, butPtr->textHeight,
		&x, &y);

	x += butPtr->indicatorSpace;

	if (relief == TK_RELIEF_SUNKEN) {
	    x += offset;
	    y += offset;
	}
	Tk_DrawTextLayout(butPtr->display, pixmap, gc, butPtr->textLayout,
		x, y, 0, -1);
	Tk_UnderlineTextLayout(butPtr->display, pixmap, gc,
		butPtr->textLayout, x, y, butPtr->underline);

	/*
	 * Draw the focus ring.  If this is a push button then we need to put
	 * it around the inner edge of the border, otherwise we put it around
	 * the text.
	 */

	if (butPtr->flags & GOT_FOCUS && butPtr->type != TYPE_LABEL) {
	    dc = TkWinGetDrawableDC(butPtr->display, pixmap, &state);
	    if (butPtr->type == TYPE_BUTTON || !butPtr->indicatorOn) {
		rect.top = butPtr->borderWidth + 1 + defaultWidth;
		rect.left = rect.top;
		rect.right = Tk_Width(tkwin) - rect.left;
		rect.bottom = Tk_Height(tkwin) - rect.top;
	    } else {
		rect.top = y-2;
		rect.left = x-2;
		rect.right = x+butPtr->textWidth + 1;
		rect.bottom = y+butPtr->textHeight + 1;
	    }
	    CkSetTextColor(dc, gc->foreground);
	    CkSetBkColor(dc, gc->background);
	    DrawFocusRect(dc, &rect);
	    TkWinReleaseDrawableDC(pixmap, dc, &state);
	}
	y += butPtr->textHeight/2;
    }

    /*
     * Draw the indicator for check buttons and radio buttons.  At this
     * point x and y refer to the top-left corner of the text or image
     * or bitmap.
     */

    if ((butPtr->type >= TYPE_CHECK_BUTTON) && butPtr->indicatorOn
	    && boxesPtr) {
	int xSrc, ySrc;

	x -= butPtr->indicatorSpace;
	y -= butPtr->indicatorDiameter / 2;

	xSrc = (butPtr->flags & SELECTED) ? boxWidth : 0;
	if (butPtr->state == tkActiveUid) {
	    xSrc += boxWidth*2;
	}
	ySrc = (butPtr->type == TYPE_RADIO_BUTTON) ? 0 : boxHeight;
		
	/*
	 * Update the palette in the boxes bitmap to reflect the current
	 * button colors.  Note that this code relies on the layout of the
	 * bitmap's palette.  Also, all of the colors used to draw the
	 * bitmap must be in the palette that is selected into the DC of
	 * the offscreen pixmap.  This requires that the static colors
	 * be placed into the palette.
	 */

	boxesPalette[PAL_CHECK] = FlipColor(gc->foreground);
	boxesPalette[PAL_TOP_OUTER] = FlipColor(TkWinGetBorderPixels(tkwin,
		border, TK_3D_DARK_GC));
	boxesPalette[PAL_TOP_INNER] = FlipColor(TkWinGetBorderPixels(tkwin,
		border, TK_3D_DARK2));
	boxesPalette[PAL_BOTTOM_INNER] = FlipColor(TkWinGetBorderPixels(tkwin,
		border, TK_3D_LIGHT2));
	boxesPalette[PAL_BOTTOM_OUTER] = FlipColor(TkWinGetBorderPixels(tkwin,
		border, TK_3D_LIGHT_GC));
	if (butPtr->state == tkDisabledUid) {
	    boxesPalette[PAL_INTERIOR] = FlipColor(TkWinGetBorderPixels(tkwin,
		border, TK_3D_LIGHT2));
	} else if (butPtr->selectBorder != NULL) {
	    boxesPalette[PAL_INTERIOR] = FlipColor(TkWinGetBorderPixels(tkwin,
		    butPtr->selectBorder, TK_3D_FLAT_GC));
	} else {
	    boxesPalette[PAL_INTERIOR] = FlipColor(GetSysColor(COLOR_WINDOW));
	}
	boxesPalette[PAL_BACKGROUND] = FlipColor(TkWinGetBorderPixels(tkwin,
		border, TK_3D_FLAT_GC));

	dc = TkWinGetDrawableDC(butPtr->display, pixmap, &state);
	StretchDIBits(dc, x, y, boxWidth, boxHeight, xSrc, ySrc, 
		boxWidth, boxHeight, boxesBits, (LPBITMAPINFO)boxesPtr, 
		DIB_RGB_COLORS, SRCCOPY);
	TkWinReleaseDrawableDC(pixmap, dc, &state);
    }

    /*
     * If the button is disabled with a stipple rather than a special
     * foreground color, generate the stippled effect.  If the widget
     * is selected and we use a different background color when selected,
     * must temporarily modify the GC.
     */

    if ((butPtr->state == tkDisabledUid)
	    && ((butPtr->disabledFg == NULL) || (butPtr->image != NULL))) {
	if ((butPtr->flags & SELECTED) && !butPtr->indicatorOn
		&& (butPtr->selectBorder != NULL)) {
	    XSetForeground(butPtr->display, butPtr->disabledGC,
		    Tk_3DBorderColor(butPtr->selectBorder)->pixel);
	}
	XFillRectangle(butPtr->display, pixmap, butPtr->disabledGC,
		butPtr->inset, butPtr->inset,
		(unsigned) (Tk_Width(tkwin) - 2*butPtr->inset),
		(unsigned) (Tk_Height(tkwin) - 2*butPtr->inset));
	if ((butPtr->flags & SELECTED) && !butPtr->indicatorOn
		&& (butPtr->selectBorder != NULL)) {
	    XSetForeground(butPtr->display, butPtr->disabledGC,
		    Tk_3DBorderColor(butPtr->normalBorder)->pixel);
	}
    }

    /*
     * Draw the border and traversal highlight last.  This way, if the
     * button's contents overflow they'll be covered up by the border.
     */

    if (relief != TK_RELIEF_FLAT) {
	Tk_Draw3DRectangle(tkwin, pixmap, border,
		defaultWidth, defaultWidth,
		Tk_Width(tkwin) - 2*defaultWidth,
		Tk_Height(tkwin) - 2*defaultWidth,
		butPtr->borderWidth, relief);
    }
    if (defaultWidth != 0) {
	dc = TkWinGetDrawableDC(butPtr->display, pixmap, &state);
	TkWinFillRect(dc, 0, 0, Tk_Width(tkwin), defaultWidth,
		butPtr->highlightColorPtr->pixel);
	TkWinFillRect(dc, 0, 0, defaultWidth, Tk_Height(tkwin),
		butPtr->highlightColorPtr->pixel);
	TkWinFillRect(dc, 0, Tk_Height(tkwin) - defaultWidth,
		Tk_Width(tkwin), defaultWidth,
		butPtr->highlightColorPtr->pixel);
	TkWinFillRect(dc, Tk_Width(tkwin) - defaultWidth, 0,
		defaultWidth, Tk_Height(tkwin),
		butPtr->highlightColorPtr->pixel);
	TkWinReleaseDrawableDC(pixmap, dc, &state);
    }

    /*
     * Copy the information from the off-screen pixmap onto the screen,
     * then delete the pixmap.
     */

    XCopyArea(butPtr->display, pixmap, Tk_WindowId(tkwin),
	    butPtr->copyGC, 0, 0, (unsigned) Tk_Width(tkwin),
	    (unsigned) Tk_Height(tkwin), 0, 0);
    Tk_FreePixmap(butPtr->display, pixmap);
}

/*
 *----------------------------------------------------------------------
 *
 * TkpComputeButtonGeometry --
 *
 *	After changes in a button's text or bitmap, this procedure
 *	recomputes the button's geometry and passes this information
 *	along to the geometry manager for the window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The button's window may change size.
 *
 *----------------------------------------------------------------------
 */

void
TkpComputeButtonGeometry(butPtr)
    register TkButton *butPtr;	/* Button whose geometry may have changed. */
{
    int width, height, avgWidth;
    Tk_FontMetrics fm;

    if (butPtr->highlightWidth < 0) {
	butPtr->highlightWidth = 0;
    }
    butPtr->inset = butPtr->highlightWidth + butPtr->borderWidth;
    butPtr->indicatorSpace = 0;

    if (!boxesPtr) {
	InitBoxes();
    }

    if (butPtr->image != NULL) {
	Tk_SizeOfImage(butPtr->image, &width, &height);
	imageOrBitmap:
	if (butPtr->width > 0) {
	    width = butPtr->width;
	}
	if (butPtr->height > 0) {
	    height = butPtr->height;
	}
	if ((butPtr->type >= TYPE_CHECK_BUTTON) && butPtr->indicatorOn) {
	    butPtr->indicatorSpace = boxWidth * 2;
	    butPtr->indicatorDiameter = boxHeight;
	}
    } else if (butPtr->bitmap != None) {
	Tk_SizeOfBitmap(butPtr->display, butPtr->bitmap, &width, &height);
	goto imageOrBitmap;
    } else {
	Tk_FreeTextLayout(butPtr->textLayout);
	butPtr->textLayout = Tk_ComputeTextLayout(butPtr->tkfont,
		butPtr->text, -1, butPtr->wrapLength, butPtr->justify, 0,
		&butPtr->textWidth, &butPtr->textHeight);

	width = butPtr->textWidth;
	height = butPtr->textHeight;
	avgWidth = Tk_TextWidth(butPtr->tkfont, "0", 1);
	Tk_GetFontMetrics(butPtr->tkfont, &fm);

	if (butPtr->width > 0) {
	    width = butPtr->width * avgWidth;
	}
	if (butPtr->height > 0) {
	    height = butPtr->height * fm.linespace;
	}

	if ((butPtr->type >= TYPE_CHECK_BUTTON) && butPtr->indicatorOn) {
	    butPtr->indicatorDiameter = boxHeight;
	    butPtr->indicatorSpace = butPtr->indicatorDiameter + avgWidth;
	}

	/*
	 * Increase the inset to allow for the focus ring.
	 */

	if (butPtr->type != TYPE_LABEL) {
	    butPtr->inset += 3;
	}
    }

    /*
     * When issuing the geometry request, add extra space for the indicator,
     * if any, and for the border and padding, plus an extra pixel so the
     * display can be offset by 1 pixel in either direction for the raised
     * or lowered effect.
     */

    if ((butPtr->image == NULL) && (butPtr->bitmap == None)) {
	width += 2*butPtr->padX;
	height += 2*butPtr->padY;
    }
    if ((butPtr->type == TYPE_BUTTON)
	    || ((butPtr->type >= TYPE_CHECK_BUTTON) && !butPtr->indicatorOn)) {
	width += 1;
	height += 1;
    }
    Tk_GeometryRequest(butPtr->tkwin, (int) (width + butPtr->indicatorSpace
	    + 2*butPtr->inset), (int) (height + 2*butPtr->inset));
    Tk_SetInternalBorder(butPtr->tkwin, butPtr->inset);
}

/*
 *----------------------------------------------------------------------
 *
 * ButtonProc --
 *
 *	This function is call by Windows whenever an event occurs on
 *	a button control created by Tk.
 *
 * Results:
 *	Standard Windows return value.
 *
 * Side effects:
 *	May generate events.
 *
 *----------------------------------------------------------------------
 */

static LRESULT CALLBACK
ButtonProc(hwnd, message, wParam, lParam)
    HWND hwnd;
    UINT message;
    WPARAM wParam;
    LPARAM lParam;
{
    LRESULT result;
    WinButton *butPtr;
    Tk_Window tkwin = Tk_HWNDToWindow(hwnd);

    if (tkwin == NULL) {
	panic("ButtonProc called on an invalid HWND");
    }
    butPtr = (WinButton *)((TkWindow*)tkwin)->instanceData;

    switch(message) {
	case WM_ERASEBKGND:
	    return 0;

	case BM_GETCHECK:
	    if (((butPtr->info.type == TYPE_CHECK_BUTTON)
		    || (butPtr->info.type == TYPE_RADIO_BUTTON))
		    && butPtr->info.indicatorOn) {
		return (butPtr->info.flags & SELECTED)
		    ? BST_CHECKED : BST_UNCHECKED;
	    }
	    return 0;

	case BM_GETSTATE: {
	    DWORD state = 0;
	    if (((butPtr->info.type == TYPE_CHECK_BUTTON)
		    || (butPtr->info.type == TYPE_RADIO_BUTTON))
		    && butPtr->info.indicatorOn) {
		state = (butPtr->info.flags & SELECTED)
		    ? BST_CHECKED : BST_UNCHECKED;
	    }
	    if (butPtr->info.flags & GOT_FOCUS) {
		state |= BST_FOCUS;
	    }
	    return state;
	}
	case WM_ENABLE:
	    break;

	case WM_PAINT: {
	    PAINTSTRUCT ps;
	    BeginPaint(hwnd, &ps);
	    EndPaint(hwnd, &ps);
	    TkpDisplayButton((ClientData)butPtr);
	    return 0;
	}
	case BN_CLICKED: {
	    int code;
	    Tcl_Interp *interp = butPtr->info.interp;
	    if (butPtr->info.state != tkDisabledUid) {
		Tcl_Preserve((ClientData)interp);
		code = TkInvokeButton((TkButton*)butPtr);
		if (code != TCL_OK && code != TCL_CONTINUE
			&& code != TCL_BREAK) {
		    Tcl_AddErrorInfo(interp, "\n    (button invoke)");
		    Tcl_BackgroundError(interp);
		}
		Tcl_Release((ClientData)interp);
	    }
	    Tcl_ServiceAll();
	    return 0;
	}

	default:
	    if (Tk_TranslateWinEvent(hwnd, message, wParam, lParam, &result)) {
		return result;
	    }
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}