Fixed bug from issue #16 (display scaling)

+ fixed bug regarding `Config_horizontalBarPos` (set to a positiv
number)

src/Bar.ahk

@@ -29,6 +29,13 @@ Bar_init(m)
   }
   Else
     wndWidth := Config_barWidth
+
+  wndWidth := Round(wndWidth * Config_scalingFactor)
+  If (Config_verticalBarPos = "tray" And m = Manager_taskBarMonitor) {
+    Bar_ctrlHeight := Round(Bar_ctrlHeight * Config_scalingFactor)
+    Bar_height := Round(Bar_height * Config_scalingFactor)
+  }
+
   Monitor_#%m%_barWidth := wndWidth
   titleWidth := wndWidth
   h1 := Bar_ctrlHeight
@@ -140,15 +147,16 @@ Bar_init(m)
   If (Config_horizontalBarPos = "left")
     x1 := 0
   Else If (Config_horizontalBarPos = "right")
-    x1 := Monitor_#%m%_width - wndWidth
+    x1 := Monitor_#%m%_width - wndWidth / Config_scalingFactor
   Else If (Config_horizontalBarPos = "center")
-    x1 := (Monitor_#%m%_width - wndWidth) / 2
+    x1 := (Monitor_#%m%_width - wndWidth / Config_scalingFactor) / 2
-  Else If (Config_horizontalBarPos => 0)
+  Else If (Config_horizontalBarPos >= 0)
     x1 := Config_horizontalBarPos
   Else If (Config_horizontalBarPos < 0)
-    x1 := Monitor_#%m%_width - wndWidth + Config_horizontalBarPos
+    x1 := Monitor_#%m%_width - wndWidth / Config_scalingFactor + Config_horizontalBarPos
   If Not (Config_verticalBarPos = "tray" And m = Manager_taskBarMonitor)
     x1 += Monitor_#%m%_x
+  x1 := Round(x1)
 
   Bar_#%m%_titleWidth := titleWidth
   Monitor_#%m%_barX := x1

src/Config.ahk

@@ -55,6 +55,9 @@ Config_init()
   Config_showTaskBar     := False
   Config_showBorder      := True
   Config_selBorderColor  := ""
+  Config_scalingFactor   := 1   ;; Undocumented. The value is retrieved by `Config_getSystemSettings()` from the registry.
+                                ;; It should not be set manually by the user,
+                                ;; but is dependant on the setting in the `Display control panel` of Windows under `Appearance and Personalization`.
 
   ;; Window arrangement
   Config_viewNames          := "1;2;3;4;5;6;7;8;9"
@@ -156,7 +159,7 @@ Config_convertSystemColor(systemColor)
 
 Config_getSystemSettings()
 {
-  Global Config_fontName, Config_fontSize, Config_normBgColor, Config_normFgColor, Config_selBgColor, Config_selFgColor
+  Global Config_fontName, Config_fontSize, Config_normBgColor, Config_normFgColor, Config_selBgColor, Config_selFgColor, Config_scalingFactor
 
   If Not Config_fontName
   {
@@ -218,6 +221,10 @@ Config_getSystemSettings()
     Config_selFgColor .= ";" Config_convertSystemColor(DllCall("GetSysColor", "Int", 2))    ;; COLOR_ACTIVECAPTION
   }
   SetFormat, Integer, d
+
+  RegRead, appliedDPI, HKEY_CURRENT_USER, Control Panel\Desktop\WindowMetrics, AppliedDPI
+  If (ErrorLevel = 0)
+    Config_scalingFactor := 96 / appliedDPI
 }
 
 Config_hotkeyLabel:

src/Monitor.ahk

@@ -136,7 +136,7 @@ Monitor_get(x, y)
 
 Monitor_getWorkArea(m)
 {
-  Local bTop, x, y
+  Local bHeight, bTop, x, y
   Local monitor, monitorBottom, monitorLeft, monitorRight, monitorTop
   Local wndClasses, wndHeight, wndId, wndWidth, wndX, wndY
 
@@ -190,18 +190,19 @@ Monitor_getWorkArea(m)
       }
     }
   }
+  bHeight := Round(Bar_height / Config_scalingFactor)
   bTop := 0
   If Monitor_#%m%_showBar
   {
     If (Config_verticalBarPos = "top" Or (Config_verticalBarPos = "tray" And Not m = Manager_taskBarMonitor))
     {
       bTop := monitorTop
-      monitorTop += Bar_height
+      monitorTop += bHeight
     }
     Else If (Config_verticalBarPos = "bottom")
     {
-      bTop := monitorBottom - Bar_height
+      bTop := monitorBottom - bHeight
-      monitorBottom -= Bar_height
+      monitorBottom -= bHeight
     }
   }