114 lines
3.4 KiB
JavaScript
114 lines
3.4 KiB
JavaScript
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// Dlg class.
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//
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// Provides some helper methods to resize a dialog window.
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function Dlg()
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{
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this._cxPerEm = 1;
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this._cyPerEm = 1;
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this._dxFrame = 0;
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this._dyFrame = 0;
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}
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/*-------------------------------------------------------------------------
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Purpose: Calculates pixels-per-em metrics, based upon the given dialog size string
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("dialogWidth:xxx; dialogHeight:yyy").
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The body of the dialog requires a DIV with width and height set to 100%.
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This is needed so we can account for the frame of the dialog when we
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resize (client vs. window rect).
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*/
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function Dlg_CalcMetrics(szDlgSize, idDivDlg)
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{
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// There's a race condition where offsetHeight can change in the middle of this
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// function if the content is greater than the window. So take a snapshot of it
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// now.
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var cxDiv = idDivDlg.offsetWidth;
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var cyDiv = idDivDlg.offsetHeight;
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var ichWidth = szDlgSize.indexOf("dialogWidth:") + 12; // 12 = cch of "dialogWidth:"
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var ichHeight = szDlgSize.indexOf("dialogHeight:") + 13; // 13 = cch of "dialogHeight:"
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var cxDlgEm = parseInt(szDlgSize.substring(ichWidth));
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var cyDlgEm = parseInt(szDlgSize.substring(ichHeight));
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/*
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alert('dialogWidth=' + window.dialogWidth + '; offsetWidth=' + cxDiv +
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'; clientWidth=' + idDivDlg.clientWidth + '\n' +
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'dialogHeight=' + window.dialogHeight + '; offsetHeight=' + cyDiv +
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'; clientHeight=' + idDivDlg.clientHeight + '\n' +
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'cxDlgEm=' + cxDlgEm + '; cyDlgEm=' + cyDlgEm);
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*/
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// dialogWidth is in pixels when read, but is in ems when written.
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// The inconsistency amazes me...but I'll make use of that fact!
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var cxWindow = parseInt(window.dialogWidth); // we expect this to be in pixels
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var cyWindow = parseInt(window.dialogHeight); // we expect this to be in pixels
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// We need to set the window size of the dialog, which is bigger than the client
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// size. So calculate the difference so we can adjust the rectangle appropriately.
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this._dxFrame = cxWindow - cxDiv;
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this._dyFrame = cyWindow - cyDiv;
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this._cxPerEm = cxWindow / cxDlgEm;
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this._cyPerEm = cyWindow / cyDlgEm;
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}
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function Dlg_CxToEms(cx)
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{
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return cx / this._cxPerEm;
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}
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function Dlg_CyToEms(cy)
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{
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return cy / this._cyPerEm;
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}
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/*-------------------------------------------------------------------------
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Purpose: Resize the dialog to the given width and height (in pixels).
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*/
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function Dlg_Resize(cx, cy)
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{
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var cxNew = this.CxToEms(cx + this._dxFrame);
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var cyNew = this.CyToEms(cy + this._dyFrame);
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// Set the dialog size to entirely accomodate the contents of the dialog
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/*
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alert('cx=' + cx + '; cxNew=' + cxNew + '; this._dxFrame=' + this._dxFrame + '\n' +
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'cy=' + cy + '; cyNew=' + cyNew + '; this._dyFrame=' + this._dyFrame);
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*/
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// We cannot simply use the ResizeTo or ResizeBy methods because they don't
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// work for dialog windows.
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window.dialogWidth = cxNew;
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window.dialogHeight = cyNew;
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}
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/*-------------------------------------------------------------------------
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Purpose: Initialize the Dlg class
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*/
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function InitDlgClass()
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{
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// Create and discard an initial Dlg object for prototypes
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new Dlg();
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// Dlg Methods
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Dlg.prototype.CalcMetrics = Dlg_CalcMetrics;
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Dlg.prototype.Resize = Dlg_Resize;
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Dlg.prototype.CxToEms = Dlg_CxToEms;
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Dlg.prototype.CyToEms = Dlg_CyToEms;
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}
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