diff options
Diffstat (limited to 'controlsize_windows.go')
| -rw-r--r-- | controlsize_windows.go | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/controlsize_windows.go b/controlsize_windows.go deleted file mode 100644 index 0afd209..0000000 --- a/controlsize_windows.go +++ /dev/null @@ -1,250 +0,0 @@ -// 24 february 2014 - -package ui - -import ( - "fmt" - "unsafe" -) - -type sysSizeData struct { - cSysSizeData - - // for size calculations - baseX int - baseY int - - // for the actual resizing - // possibly the HDWP -} - -const ( - marginDialogUnits = 7 - paddingDialogUnits = 4 -) - -func (s *sysData) beginResize() (d *sysSizeData) { - d = new(sysSizeData) - - dc := getTextDC(s.hwnd) - defer releaseTextDC(s.hwnd, dc) - - var tm _TEXTMETRICS - - r1, _, err := _getTextMetrics.Call( - uintptr(dc), - uintptr(unsafe.Pointer(&tm))) - if r1 == 0 { // failure - panic(fmt.Errorf("error getting text metrics for preferred size calculations: %v", err)) - } - d.baseX = int(tm.tmAveCharWidth) // TODO not optimal; third reference has better way - d.baseY = int(tm.tmHeight) - - if s.spaced { - d.xmargin = muldiv(marginDialogUnits, d.baseX, 4) - d.ymargin = muldiv(marginDialogUnits, d.baseY, 8) - d.xpadding = muldiv(paddingDialogUnits, d.baseX, 4) - d.ypadding = muldiv(paddingDialogUnits, d.baseY, 8) - } - - return d -} - -func (s *sysData) endResize(d *sysSizeData) { - // redraw -} - -func (s *sysData) translateAllocationCoords(allocations []*allocation, winwidth, winheight int) { - // no translation needed on windows -} - -func (s *sysData) commitResize(c *allocation, d *sysSizeData) { - yoff := stdDlgSizes[s.ctype].yoff - if s.alternate { - yoff = stdDlgSizes[s.ctype].yoffalt - } - if yoff != 0 { - yoff = muldiv(yoff, d.baseY, 8) - } - c.y += yoff - // TODO move this here - s.setRect(c.x, c.y, c.width, c.height, 0) -} - -func (s *sysData) getAuxResizeInfo(d *sysSizeData) { - // do nothing -} - -// For Windows, Microsoft just hands you a list of preferred control sizes as part of the MSDN documentation and tells you to roll with it. -// These sizes are given in "dialog units", which are independent of the font in use. -// We need to convert these into standard pixels, which requires we get the device context of the OS window. -// References: -// - http://msdn.microsoft.com/en-us/library/windows/desktop/aa511279.aspx#controlsizing for control sizes -// - http://msdn.microsoft.com/en-us/library/ms645502%28VS.85%29.aspx - the calculation needed -// - http://support.microsoft.com/kb/125681 - to get the base X and Y -// (thanks to http://stackoverflow.com/questions/58620/default-button-size) -// For push buttons, date/time pickers, links (which we don't use), toolbars, and rebars (another type of toolbar), Common Controls version 6 provides convenient methods to use instead, falling back to the old way if it fails. - -// As we are left with incomplete data, an arbitrary size will be chosen -const ( - defaultWidth = 100 // 2 * preferred width of buttons -) - -type dlgunits struct { - width int - height int - longest bool // TODO actually use this - getsize uintptr - area bool // use area sizes instead - yoff int - yoffalt int -} - -var stdDlgSizes = [nctypes]dlgunits{ - c_button: dlgunits{ - width: 50, - height: 14, - getsize: _BCM_GETIDEALSIZE, - }, - c_checkbox: dlgunits{ - // widtdh is not defined here so assume longest - longest: true, - height: 10, - }, - c_combobox: dlgunits{ - // technically the height of a combobox has to include the drop-down list (this is a historical accident: originally comboboxes weren't drop-down) - // but since we're forcing Common Controls version 6, we can take advantage of one of its mechanisms to automatically fix this mistake (bad practice but whatever) - // see also: http://blogs.msdn.com/b/oldnewthing/archive/2006/03/10/548537.aspx - // note that the Microsoft guidelines pages don't take the list size into account - longest: true, - height: 12, // from http://msdn.microsoft.com/en-us/library/windows/desktop/bb226818%28v=vs.85%29.aspx; the page linked above says 14 - }, - c_lineedit: dlgunits{ - longest: true, - height: 14, - }, - c_label: dlgunits{ - longest: true, - height: 8, - yoff: 3, - yoffalt: 0, - }, - c_listbox: dlgunits{ - longest: true, - // height is not clearly defined here ("an integral number of items (3 items minimum)") so just use a three-line edit control - height: 14 + 10 + 10, - }, - c_progressbar: dlgunits{ - width: 237, // the first reference says 107 also works; TODO decide which to use - height: 8, - }, - c_area: dlgunits{ - area: true, - }, -} - -var ( - _selectObject = gdi32.NewProc("SelectObject") - _getDC = user32.NewProc("GetDC") - _getTextExtentPoint32 = gdi32.NewProc("GetTextExtentPoint32W") - _getTextMetrics = gdi32.NewProc("GetTextMetricsW") - _releaseDC = user32.NewProc("ReleaseDC") -) - -func getTextDC(hwnd _HWND) (dc _HANDLE) { - r1, _, err := _getDC.Call(uintptr(hwnd)) - if r1 == 0 { // failure - panic(fmt.Errorf("error getting DC for preferred size calculations: %v", err)) - } - dc = _HANDLE(r1) - r1, _, err = _selectObject.Call( - uintptr(dc), - uintptr(controlFont)) - if r1 == 0 { // failure - panic(fmt.Errorf("error loading control font into device context for preferred size calculation: %v", err)) - } - return dc -} - -func releaseTextDC(hwnd _HWND, dc _HANDLE) { - r1, _, err := _releaseDC.Call( - uintptr(hwnd), - uintptr(dc)) - if r1 == 0 { // failure - panic(fmt.Errorf("error releasing DC for preferred size calculations: %v", err)) - } -} - -func (s *sysData) preferredSize(d *sysSizeData) (width int, height int) { - // the preferred size of an Area is its size - if stdDlgSizes[s.ctype].area { - return s.areawidth, s.areaheight - } - - if msg := stdDlgSizes[s.ctype].getsize; msg != 0 { - var size _SIZE - - r1, _, _ := _sendMessage.Call( - uintptr(s.hwnd), - msg, - uintptr(0), - uintptr(unsafe.Pointer(&size))) - if r1 != uintptr(_FALSE) { // success - return int(size.cx), int(size.cy) - } - // otherwise the message approach failed, so fall back to the regular approach - println("message failed; falling back") - } - - width = stdDlgSizes[s.ctype].width - if width == 0 { - width = defaultWidth - } - height = stdDlgSizes[s.ctype].height - width = muldiv(width, d.baseX, 4) // equivalent to right of rect - height = muldiv(height, d.baseY, 8) // equivalent to bottom of rect - - return width, height -} - -var ( - _mulDiv = kernel32.NewProc("MulDiv") -) - -func muldiv(ma int, mb int, div int) int { - // div will not be 0 in the usages above - // we also ignore overflow; that isn't likely to happen for our use case anytime soon - r1, _, _ := _mulDiv.Call( - uintptr(int32(ma)), - uintptr(int32(mb)), - uintptr(int32(div))) - return int(int32(r1)) -} - -type _SIZE struct { - cx int32 // originally LONG - cy int32 -} - -type _TEXTMETRICS struct { - tmHeight int32 - tmAscent int32 - tmDescent int32 - tmInternalLeading int32 - tmExternalLeading int32 - tmAveCharWidth int32 - tmMaxCharWidth int32 - tmWeight int32 - tmOverhang int32 - tmDigitizedAspectX int32 - tmDigitizedAspectY int32 - tmFirstChar uint16 - tmLastChar uint16 - tmDefaultChar uint16 - tmBreakChar uint16 - tmItalic byte - tmUnderlined byte - tmStruckOut byte - tmPitchAndFamily byte - tmCharSet byte -} |