c# - Bad user control scaling for higher screen DPI -


i have user control called labeledcombobox consist of tablelayoutpanel (tlp) contains 2 columns - in first column there label control, in second - combobox.

generally have done make control dpi-aware still behaves bad dpi > 96. ok when font size control not changed (the same in design / runtime, here 9.75). when increase font size 9.75 11 or 12, user control not scaled , gets cropped @ bottom when displayed on dpi > 96.

below screen of 3 examples different font size, starting left: 9.75 (same in design), 11, , 12.

enter image description here

here how code designer looks like:

    private void initializecomponent()     {         this.tlp = new system.windows.forms.tablelayoutpanel();         this.combobox = new system.windows.forms.combobox();         this.label = new system.windows.forms.label();         this.tlp.suspendlayout();         this.suspendlayout();         //          // tlp         //          this.tlp.autosize = true;         this.tlp.autosizemode = system.windows.forms.autosizemode.growandshrink;         this.tlp.backcolor = system.drawing.color.steelblue;         this.tlp.columncount = 2;         this.tlp.columnstyles.add(new system.windows.forms.columnstyle(system.windows.forms.sizetype.absolute, 100f));         this.tlp.columnstyles.add(new system.windows.forms.columnstyle(system.windows.forms.sizetype.absolute, 100f));         this.tlp.controls.add(this.combobox, 1, 0);         this.tlp.controls.add(this.label, 0, 0);         this.tlp.dock = system.windows.forms.dockstyle.fill;         this.tlp.font = new system.drawing.font("segoe ui", 9.75f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((byte)(238)));         this.tlp.forecolor = system.drawing.color.white;         this.tlp.location = new system.drawing.point(0, 0);         this.tlp.name = "tlp";         this.tlp.rowcount = 1;         this.tlp.rowstyles.add(new system.windows.forms.rowstyle());         this.tlp.size = new system.drawing.size(200, 30);         this.tlp.tabindex = 74;         //          // combobox         //          this.combobox.backcolor = system.drawing.color.white;         this.combobox.displaymember = "name";         this.combobox.dock = system.windows.forms.dockstyle.fill;         this.combobox.drawmode = system.windows.forms.drawmode.ownerdrawfixed;         this.combobox.dropdownstyle = system.windows.forms.comboboxstyle.dropdownlist;         this.combobox.flatstyle = system.windows.forms.flatstyle.flat;         this.combobox.font = new system.drawing.font("segoe ui", 9.75f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((byte)(238)));         this.combobox.formattingenabled = true;         this.combobox.location = new system.drawing.point(102, 2);         this.combobox.margin = new system.windows.forms.padding(2);         this.combobox.name = "combobox";         this.combobox.size = new system.drawing.size(96, 26);         this.combobox.drawitem += new system.windows.forms.drawitemeventhandler(this.combobox_drawitem);         this.combobox.selectedindexchanged += new system.eventhandler(this.combobox_selectedindexchanged);         this.combobox.datasourcechanged += new system.eventhandler(this.combobox_datasourcechanged);         //          // label         //          this.label.autosize = true;         this.label.backcolor = system.drawing.color.steelblue;         this.label.dock = system.windows.forms.dockstyle.fill;         this.label.font = new system.drawing.font("segoe ui", 9.75f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((byte)(238)));         this.label.location = new system.drawing.point(2, 2);         this.label.margin = new system.windows.forms.padding(2);         this.label.name = "label";         this.label.size = new system.drawing.size(96, 26);         this.label.tabindex = 59;         this.label.text = "[label]";         this.label.textalign = system.drawing.contentalignment.middleleft;         //          // labeledcombobox         //          this.autoscaledimensions = new system.drawing.sizef(96f, 96f);         this.autoscalemode = system.windows.forms.autoscalemode.dpi;         this.autosize = true;         this.autosizemode = system.windows.forms.autosizemode.growandshrink;         this.backcolor = system.drawing.color.steelblue;         this.controls.add(this.tlp);         this.name = "labeledcombobox";         this.size = new system.drawing.size(200, 30);         this.tlp.resumelayout(false);         this.tlp.performlayout();         this.resumelayout(false);         this.performlayout();      }

i use extension method re-draw content of combobox:

public static class comboboxext {     public static void drawcustomitem(this combobox cb, string item, drawitemeventargs e)     {         var fillcolor = ((e.state & drawitemstate.selected) == drawitemstate.selected) ? color.powderblue : color.white;         e.graphics.fillrectangle(new solidbrush(fillcolor), e.bounds);         e.graphics.drawstring(item, e.font, new solidbrush(color.black), new point(e.bounds.x, e.bounds.y));     } }

code labeledcombobox:

public partial class labeledcombobox : usercontrol {     double dpi = graphics.fromhwnd(intptr.zero).dpix / 96.0;      public labeledcombobox()     {         initializecomponent();     }      public labeledcombobox(string name)     {         initializecomponent();         name = name;     }      [browsable(true)]     [category("labeledcombobox")]     public float fontsize     {         { return label.font.sizeinpoints; }         set         {             label.font = combobox.font = new font(label.font.fontfamily, value, graphicsunit.point);             invalidate();         }     }      [browsable(true)]     [category("labeledcombobox")]     public int labelwidth     {         { return (int)tlp.columnstyles[0].width; }         set { tlp.columnstyles[0].width = convert.toint32(dpi * value); invalidate(); }     }      [browsable(true)]     [category("labeledcombobox")]     public int comboboxwidth     {         { return (int)tlp.columnstyles[1].width; }         set { tlp.columnstyles[1].width = convert.toint32(dpi * value); invalidate(); }     }      [browsable(true)]     [category("labeledcombobox")]     public string comboboxdisplaymember     {         { return combobox.displaymember; }         set { combobox.displaymember = value; invalidate(); }     }      [browsable(true)]     [category("labeledcombobox")]     public object[] comboboxitems     {         { return combobox.datasource object[]; }         set { combobox.datasource = value; invalidate(); }     }      [browsable(true)]     [category("labeledcombobox")]     public string labeltext     {         { return label.text; }         set { label.text = value; invalidate(); }     }      [browsable(false)]     public object selecteditem { get; set; }      public delegate void selecteditemchangedhandler(object sender, labeledcomboboxitemselectedeventargs e);      public event selecteditemchangedhandler selecteditemchanged;      private void combobox_drawitem(object sender, drawitemeventargs e)     {         if (e.index >= 0)         {             selecteditem = combobox.items[e.index];             combobox.drawcustomitem(selecteditem.gettype().getproperty(combobox.displaymember).getvalue(selecteditem, null) string, e);         }     }      private void combobox_selectedindexchanged(object sender, system.eventargs e)     {         if (combobox.selectedindex >= 0)         {             selecteditem = combobox.items[combobox.selectedindex];             selecteditemchanged?.invoke(this, new labeledcomboboxitemselectedeventargs { selecteditem = selecteditem });         }     }      private void combobox_datasourcechanged(object sender, system.eventargs e)     {         if (combobox.items.count > 0)         {             combobox.selectedindex = 0;         }     }

why control cropped when shown on high dpi's ? how fix this? highly appreciated.

update: screens 96 , 150 dpi - undocked combobox

enter image description here enter image description here


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