From 339c0f724270d2ce391a03f561746fbe5beeee5b Mon Sep 17 00:00:00 2001
From: David Laurence Emerson <dle3ab@angelbase.com>
Date: Tue, 28 May 2013 01:07:29 -0700
Subject: Horizontal Scrolling working in X11, basegrid unit updated to use it

---
 examples/gui/gridtest/gridtest.lpi | 13 +++++++------
 examples/gui/gridtest/gridtest.lpr |  3 +++
 src/gui/fpg_basegrid.pas           | 40 ++++++++++++++++++++++++++------------
 3 files changed, 38 insertions(+), 18 deletions(-)

diff --git a/examples/gui/gridtest/gridtest.lpi b/examples/gui/gridtest/gridtest.lpi
index 8d6de301..06af36d7 100644
--- a/examples/gui/gridtest/gridtest.lpi
+++ b/examples/gui/gridtest/gridtest.lpi
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <CONFIG>
   <ProjectOptions>
-    <Version Value="8"/>
+    <Version Value="9"/>
     <General>
       <Flags>
         <SaveOnlyProjectUnits Value="True"/>
@@ -9,11 +9,13 @@
       </Flags>
       <SessionStorage Value="InProjectDir"/>
       <MainUnit Value="0"/>
-      <TargetFileExt Value=""/>
     </General>
     <VersionInfo>
-      <StringTable Comments="" CompanyName="" FileDescription="" FileVersion="0.0.0.0" InternalName="" LegalCopyright="" LegalTrademarks="" OriginalFilename="" ProductName="" ProductVersion=""/>
+      <StringTable ProductVersion=""/>
     </VersionInfo>
+    <BuildModes Count="1">
+      <Item1 Name="default" Default="True"/>
+    </BuildModes>
     <PublishOptions>
       <Version Value="2"/>
       <IncludeFileFilter Value="*.(pas|pp|inc|lfm|lpr|lrs|lpi|lpk|sh|xml)"/>
@@ -39,15 +41,14 @@
     </Units>
   </ProjectOptions>
   <CompilerOptions>
-    <Version Value="9"/>
+    <Version Value="11"/>
     <Parsing>
       <SyntaxOptions>
         <UseAnsiStrings Value="False"/>
       </SyntaxOptions>
     </Parsing>
     <Other>
-      <CustomOptions Value="-FUunits
-"/>
+      <CustomOptions Value="-FUunits"/>
       <CompilerPath Value="$(CompPath)"/>
     </Other>
   </CompilerOptions>
diff --git a/examples/gui/gridtest/gridtest.lpr b/examples/gui/gridtest/gridtest.lpr
index 465281b2..9fbce666 100644
--- a/examples/gui/gridtest/gridtest.lpr
+++ b/examples/gui/gridtest/gridtest.lpr
@@ -219,6 +219,9 @@ begin
     AddColumn('Column 1', 100, taLeftJustify);
     AddColumn('Col 2', 50, taCenter);
     AddColumn('Numbers', 150, taRightJustify);
+    AddColumn('Column 4', 150, taRightJustify);
+    AddColumn('Column 5', 150, taRightJustify);
+    AddColumn('Column 6', 150, taRightJustify);
     FontDesc := '#Grid';
     HeaderFontDesc := '#GridHeader';
     Hint := '';
diff --git a/src/gui/fpg_basegrid.pas b/src/gui/fpg_basegrid.pas
index cc8bf0a6..127403b3 100644
--- a/src/gui/fpg_basegrid.pas
+++ b/src/gui/fpg_basegrid.pas
@@ -593,6 +593,8 @@ var
   vl: integer;
   i: integer;
   x: integer;
+  hmax: integer;
+  vmax: integer;
   Hfits, showH : boolean;
   Vfits, showV : boolean;
 
@@ -707,7 +709,10 @@ begin
       FVScrollBar.SliderSize := VisibleLines / RowCount
     else
       FVScrollBar.SliderSize := 0;
-    FVScrollBar.Max         := RowCount-VisibleLines;
+    vmax := RowCount-VisibleLines;
+    if FFirstRow>vmax then
+      FFirstRow:=vmax;
+    FVScrollBar.Max         := vmax;
     FVScrollBar.Position    := FFirstRow;
     FVScrollBar.RepaintSlider;
     FVScrollBar.Top     := 2;
@@ -728,7 +733,10 @@ begin
     FHScrollBar.Min         := 0;
     if go_SmoothScroll in FOptions then
     begin
-      FHScrollBar.Max := cw - vw;
+      hmax := cw - vw;
+      FHScrollBar.Max := hmax;
+      if FXOffset>hmax then
+        FXOffset:=hmax;
       FHScrollBar.Position := FXOffset;
       FHScrollBar.SliderSize := HWidth / TotalColumnWidth;
       FHScrollBar.PageSize := 5;
@@ -1195,26 +1203,34 @@ end;
 
 procedure TfpgBaseGrid.HandleMouseHorizScroll(x, y: integer; shiftstate: TShiftState; delta: smallint);
 var
-  lCol: Integer;
+  old_val: Integer;
 begin
   inherited HandleMouseHorizScroll(x, y, shiftstate, delta);
 
-  lCol := FFirstCol;
-
   if go_SmoothScroll in Options then
   begin
-    ;
+    old_val := FXOffset;
+    inc(FXOffset, delta*FHScrollBar.ScrollStep);
+    if (FXOffset<0) then
+      FXOffset:=0;
+    // finding the maximum Xoffset is tricky, let updatescrollbars do it.
+    if (FXOffset=old_val) then
+      Exit;
   end
   else
   begin
+    old_val := FFirstCol;
     inc(FFirstCol, delta);
+    if FFirstCol<0 then
+      FFirstCol:=0
+    else if FFirstCol > ColumnCount-1 then
+      FFirstCol:=ColumnCount-1;
+    if FFirstCol=old_val then
+      Exit;
   end;
 
-  if lCol <> FFirstCol then
-  begin
-    UpdateScrollBars;
-    RePaint;
-  end;
+  UpdateScrollBars;
+  RePaint;
 end;
 
 procedure TfpgBaseGrid.HandleMouseMove(x, y: integer; btnstate: word; shiftstate: TShiftState);
@@ -1500,7 +1516,7 @@ begin
   FHScrollBar.Orientation := orHorizontal;
   FHScrollBar.Visible     := False;
   FHScrollBar.OnScroll    := @HScrollBarMove;
-  FHScrollBar.ScrollStep  := 5;
+  FHScrollBar.ScrollStep  := 20;
 end;
 
 destructor TfpgBaseGrid.Destroy;
-- 
cgit v1.2.3-70-g09d2