Verticaly center text in string gadget.

captain_skank · **Posted:** Mon Jun 10, 2019 9:42 am

Hi,

Is it possible?

Is there an option like #SS_CENTERIMAGE for textgadget?

Any help appreciated.

Thanks

mk-soft · **Posted:** Mon Jun 10, 2019 9:58 am

The operator system does not support them.
Possibly create it yourself with the CanvasGadget

RSBasic · **Posted:** Mon Jun 10, 2019 9:58 am

viewtopic.php?p=285352#p285352

RASHAD · **Joined:** Sun Apr 12, 2009 6:27 am **Posts:** 3496

Simple & cross platform
You can play around it

Code:

LoadFont(0,"Tahoma",14)

OpenWindow(0, 0, 0, 600, 400, "StringGadget ", #PB_Window_SystemMenu|#PB_Window_ScreenCentered|#PB_Window_SizeGadget)
SetWindowColor(0,#White)
StringGadget(1, 10,10,580,40,"ABCDEJQ")
SetGadgetFont(1,FontID(0))
h = GadgetHeight(1,#PB_Gadget_RequiredSize)
ResizeGadget(1,10,10,#PB_Ignore,h)

Repeat

Until WaitWindowEvent() = #PB_Event_CloseWindow

captain_skank · **Posted:** Mon Jun 10, 2019 10:30 am

Thanks for the quick reponses - gotta love this forum.

Rashad's code from this thread works fine for me.

FYI - Rashad's code from the other thread, that RSBasic pointed, to works in ordinary mode but fails in DPI aware mode.

I really am not understanding the DPI awareness commands - I thought I had all this working and then tried it on a windows client @ 150% and nearly melted my eyes :mrgreen:

Shardik · **Posted:** Mon Jun 10, 2019 9:20 pm

RASHAD wrote:

Simple & cross platform

Simple yes but not cross-platform. It's working nice on Windows and Linux but not on MacOS:

Another drawback is that you can't freely choose the vertical height of the TextGadget but having to use the fixed #PB_Gadget_RequiredSize.

My example is able to toggle the vertical text alignment and uses the respective API functions for the different operating systems. Unfortunately on Windows it seems that SS_CENTERIMAGE can only be used when creating the TextGadget. Using

Code:

SetWindowLongPtr_(GadgetID(0), #GWL_STYLE, GetWindowLongPtr_(GadgetID(0), #GWL_STYLE) ! #SS_CENTERIMAGE)
UpdateWindow_GadgetID(0)

to dynamically change the vertical text alignment doesn't work. So on Windows it's necessary to always newly create the TextGadget with or without SS_CENTERIMAGE. On Linux and MacOS the dynamic changing of vertical alignment is no problem.

I have tested my example successfully on these operating systems:
- Linux Mint 19.1 x64 'Tessa' with Cinnamon and GTK3
- MacOS 10.6.8 'Snow Leopard'
- MacOS 10.14.5 'Mojave'
- Windows 7 x64 SP1.

Code:

EnableExplicit

Define CenterVertically.I

CompilerIf #PB_Compiler_OS = #PB_OS_Linux
  ImportC ""
    gtk_label_set_yalign(*Label.GtkLabel, xalign.F)
  EndImport
CompilerEndIf

OpenWindow(0, 270, 100, 310, 100, "Center text vertically")
TextGadget(0, 10, 10, 290, 40, "The quick brown fox jumps over the lazy dog.",
  #PB_Text_Border | #PB_Text_Center)
ButtonGadget(1, 65, 60, 180, 25, "Toggle vertical centering")

Repeat
  Select WaitWindowEvent()
    Case #PB_Event_CloseWindow
      Break
    Case #PB_Event_Gadget
      If EventGadget() = 1
        CenterVertically ! 1

        CompilerSelect #PB_Compiler_OS
          CompilerCase #PB_OS_Linux
            gtk_label_set_yalign(GadgetID(0), CenterVertically * 0.5)
          CompilerCase #PB_OS_MacOS
            CocoaMessage(0, CocoaMessage(0, GadgetID(0), "cell"),
              "_setVerticallyCentered:", CenterVertically)
            CocoaMessage(0, GadgetID(0), "setNeedsDisplay:", #True)
          CompilerCase #PB_OS_Windows
            If CenterVertically
              TextGadget(0, 10, 10, 290, 40,
                "The quick brown fox jumps over the lazy dog.",
                #PB_Text_Border | #PB_Text_Center | #SS_CENTERIMAGE)
            Else
              TextGadget(0, 10, 10, 290, 40,
                "The quick brown fox jumps over the lazy dog.",
                #PB_Text_Border | #PB_Text_Center)
            EndIf

         CompilerEndSelect
      EndIf
  EndSelect
ForEver

Edit: I have removed this debug line twice

Code:

Debug "GWL_STYLE = $" + Hex(GetWindowLongPtr_(GadgetID(0), #GWL_STYLE))

because it's not cross-platform since using Windows API code.

RASHAD · **Joined:** Sun Apr 12, 2009 6:27 am **Posts:** 3496

Hi Shardik
StringGadget() is the requested not the TextGadget()
There is a big difference you know
If is GadgetHeight(gadget,#PB_Gadget_RequiredSize) does not work with Mac so Fred should be informed

Justin · **Joined:** Sat Apr 26, 2003 2:49 pm **Posts:** 655

On Windows you have to use InvalidateRect_() to update the control.
This works:

Code:

EnableExplicit

Define CenterVertically.I

CompilerIf #PB_Compiler_OS = #PB_OS_Linux
  ImportC ""
    gtk_label_set_yalign(*Label.GtkLabel, xalign.F)
  EndImport
CompilerEndIf

OpenWindow(0, 270, 100, 310, 100, "Center text vertically")
TextGadget(0, 10, 10, 290, 40, "The quick brown fox jumps over the lazy dog.",
  #PB_Text_Border | #PB_Text_Center)
ButtonGadget(1, 65, 60, 180, 25, "Toggle vertical centering")
Debug "GWL_STYLE = $" + Hex(GetWindowLongPtr_(GadgetID(0), #GWL_STYLE))

Repeat
  Select WaitWindowEvent()
    Case #PB_Event_CloseWindow
      Break
    Case #PB_Event_Gadget
      If EventGadget() = 1
        CenterVertically ! 1

        CompilerSelect #PB_Compiler_OS
          CompilerCase #PB_OS_Linux
            gtk_label_set_yalign(GadgetID(0), CenterVertically * 0.5)
          CompilerCase #PB_OS_MacOS
            CocoaMessage(0, CocoaMessage(0, GadgetID(0), "cell"),
              "_setVerticallyCentered:", CenterVertically)
            CocoaMessage(0, GadgetID(0), "setNeedsDisplay:", #True)
            
          CompilerCase #PB_OS_Windows
            If CenterVertically
               SetWindowLongPtr_(GadgetID(0), #GWL_STYLE, GetWindowLongPtr_(GadgetID(0), #GWL_STYLE) | #SS_CENTERIMAGE)
;   
            Else
                    SetWindowLongPtr_(GadgetID(0), #GWL_STYLE, GetWindowLongPtr_(GadgetID(0), #GWL_STYLE) & ~#SS_CENTERIMAGE)

            EndIf
            InvalidateRect_(GadgetID(0), #Null, #True)

            Debug "GWL_STYLE = $" + Hex(GetWindowLongPtr_(GadgetID(0), #GWL_STYLE))
        CompilerEndSelect
      EndIf
  EndSelect
ForEver

Shardik · **Posted:** Mon Jun 10, 2019 10:34 pm

RASHAD wrote:

StringGadget() is the requested not the TextGadget()

Sorry, you are right, RASHAD. I simply overread the "like" in

captain_skank wrote:

Is there an option like #SS_CENTERIMAGE for textgadget?

But I tested your code with StringGadget and took the snapshot for MacOS...

Tomorrow I will try to find a cross-platform solution to vertically align text in a StringGadget...

Justin wrote:

On Windows you have to use InvalidateRect_() to update the control.

Thank you for finding out how to align the text vertically in the TextGadget dynamically even on Windows, Justin! That's much more elegant than always recreating the TextGadget. I had exactly tested the same Windows code as you, but only tested with UpdateWindow_() instead of InvalidateRect_().

RASHAD · **Joined:** Sun Apr 12, 2009 6:27 am **Posts:** 3496

Hi Shardik
Can you check ?
https://www.purebasic.fr/english/viewtopic.php?f=12&t=72996

Shardik · **Posted:** Tue Jun 11, 2019 9:32 pm

RASHAD wrote:

StringGadget() is the requested not the TextGadget()
There is a big difference you know

Yes, after realizing to have posted an example for the wrong Gadget, I found the following Windows examples for the StringGadget in my example collection (one posted by you):
- Sparkie (2005)
- TerryHough (2006)
- Fluid Byte (2007)
- IdeasVacuum (2007)
- RASHAD (2008)
The examples from FluidByte, TerryHough and you seem to be derived from Sparkie's because they use the same variable name eRect.RECT... :wink:

RASHAD wrote:

Hi Shardik
Can you check ?
viewtopic.php?f=12&t=72996

I have posted directly in your linked thread.

Shardik wrote:

Tomorrow I will try to find a cross-platform solution to vertically align text in a StringGadget...

I had to find out that on Linux PureBasic utilizes the GtkEntry which is only for single line text input and which doesn't allow vertical alignment at all. So on Linux the text in a StringGadget is always vertically centered by default.

Nevertheless, this is my cross-platform solution for toggling the vertical position of text in the StringGadget (on Linux only an information is displayed) :

Code:

EnableExplicit

Define CenterVertically.I

Procedure AlignTextVertically(StringGadgetID, CenterVertically.I)
  CompilerSelect #PB_Compiler_OS
    CompilerCase #PB_OS_Linux
      MessageRequester("Info",
        "On Linux the text in a StringGadget (GtkEntry) is always " +
        "vertically centered by default and this cannot be changed!")
    CompilerCase #PB_OS_MacOS
      CocoaMessage(0, CocoaMessage(0, GadgetID(StringGadgetID), "cell"),
        "_setVerticallyCentered:", CenterVertically)
      CocoaMessage(0, GadgetID(StringGadgetID), "setNeedsDisplay:", #True)
    CompilerCase #PB_OS_Windows
      Protected ClientRect.RECT
      Protected DCHandle.I
      Protected Text.S = GetGadgetText(StringGadgetID)
      Protected TextXY.SIZE
 
      DCHandle = GetDC_(GadgetID(StringGadgetID))
      SelectObject_(DCHandle, GetGadgetFont(StringGadgetID))
      GetTextExtentPoint32_(DCHandle, Text, Len(Text), @TextXY)
      ReleaseDC_(GadgetID(StringGadgetID), DCHandle)
      GetClientRect_(GadgetID(StringGadgetID), ClientRect)

      If CenterVertically
        ClientRect\top = (ClientRect\bottom - TextXY\cy) / 2 - 1
      EndIf

      SendMessage_(GadgetID(StringGadgetID), #EM_SETRECT, 0, ClientRect)
      InvalidateRect_(GadgetID(0), 0, #True)
  CompilerEndSelect
EndProcedure

OpenWindow(0, 270, 100, 330, 100, "Center text vertically")

CompilerIf #PB_Compiler_OS = #PB_OS_Windows
  StringGadget(0, 10, 10, 310, 40,
    "The quick brown fox jumps over the lazy dog.", #ES_MULTILINE)
CompilerElse
  StringGadget(0, 10, 10, 310, 40,
    "The quick brown fox jumps over the lazy dog.")
CompilerEndIf

ButtonGadget(1, 70, 60, 180, 25, "Toggle vertical centering")

Repeat
  Select WaitWindowEvent()
    Case #PB_Event_CloseWindow
      Break
    Case #PB_Event_Gadget
      If EventGadget() = 1
        CenterVertically ! 1
        AlignTextVertically(0, CenterVertically)
      EndIf
  EndSelect
ForEver

Edit 1: In Windows the StringGadget is now created with #ES_MULTILINE.
Edit 2: I have added the following line in the Windows-specific code to correctly handle different font sizes:

Code:

SelectObject_(DCHandle, GetGadgetFont(StringGadgetID))

RASHAD · **Joined:** Sun Apr 12, 2009 6:27 am **Posts:** 3496

1- You forgot that srod snippet based on Sparkie's too
2- Your link for my snippet is wrong it links to this thread

3- Your last code does not work with Windows

Shardik · **Posted:** Wed Jun 12, 2019 7:23 am

RASHAD wrote:

1- You forgot that srod snippet based on Sparkie's too

I am sure that I have still missed some other examples too... :wink:

RASHAD wrote:

2- Your link for my snippet is wrong it links to this thread

Sorry, but the link to your snippet correctly links to your example in the thread "Set Center Align in StringGadget : Vertical 'n' Horizontal" from 2018. It doesn't link to this thread named "Verticaly center text in string gadget." started by captain_skank.

RASHAD wrote:

3- Your last code does not work with Windows

I should never post cross-platform examples after having made short changes when testing the code on other operating systems and being too tired... :wink:

I had forgotten to remark that on Windows the StringGadget has to be set into multiline mode (#ES_MULTILINE) in order to center the text vertically. In my Windows specific code I had removed the flag #ES_MULTILINE from the StringGadget() definition line (because it's not cross-platform) and moved it to the Windows-specific code. But in Windows it seems that you can't change a StringGadget's style after its declaration to be multilined:

Code:

SetWindowLongPtr_(GadgetID(0), #GWL_STYLE, GetWindowLongPtr_(GadgetID(0), #GWL_STYLE) ! #ES_MULTILINE)

Even a following InvalidateRect_() and UpdateWindow_() doesn't help...

Thank you for testing and reporting! I have modified my example above.

captain_skank · **Posted:** Wed Jun 12, 2019 9:40 am

This is making my head hurt.

Testing with the code Shardik provided the results look fine with the default font, but off center with any other font

Code:

    EnableExplicit

    Define CenterVertically.I
    
    ;Global f_12.i = LoadFont(#PB_Any,"Calibri Light", 12, #PB_Font_HighQuality)
    Global f_12.i = LoadFont(#PB_Any,"Arial", 12, #PB_Font_HighQuality)
    
    Procedure AlignTextVertically(StringGadgetID, CenterVertically.I)

      Protected ClientRect.RECT
      Protected DCHandle.I
      Protected Text.S = GetGadgetText(StringGadgetID)
      Protected TextXY.SIZE
      
      DCHandle = GetDC_(GadgetID(StringGadgetID))
      GetTextExtentPoint32_(DCHandle, Text, Len(Text), @TextXY)
      ReleaseDC_(GadgetID(StringGadgetID), DCHandle)
      GetClientRect_(GadgetID(StringGadgetID), ClientRect)
      
      If CenterVertically
        ClientRect\top = (ClientRect\bottom - TextXY\cy) / 2
      EndIf
      
      SendMessage_(GadgetID(StringGadgetID), #EM_SETRECT, 0, ClientRect)
      InvalidateRect_(GadgetID(0), 0, #True)

    EndProcedure

    OpenWindow(0, 270, 100, 330, 200, "Center text vertically")
    
    StringGadget(0, 10, 10, 310, 40, "The quick brown fox jumps over the lazy dog.", #ES_MULTILINE)
    
    StringGadget(1, 10, 60, 310, 40, "The quick brown fox jumps over the lazy dog.", #ES_MULTILINE)
      SetGadgetFont(1, FontID(f_12))
    
    ButtonGadget(2, 70, 110, 180, 25, "Toggle vertical centering")

    Repeat
      Select WaitWindowEvent()
        Case #PB_Event_CloseWindow
          Break
        Case #PB_Event_Gadget
          If EventGadget() = 2
            CenterVertically ! 1
            AlignTextVertically(0, CenterVertically)
            AlignTextVertically(1, CenterVertically)
          EndIf
      EndSelect
    ForEver

I got rid of the non windows code for my purposes.

Shardik · **Posted:** Wed Jun 12, 2019 12:31 pm

Sorry, I didn't take the font size into account. I had to add

Code:

SelectObject_(DCHandle, GetGadgetFont(StringGadgetID))

in my example above. This is your modified Windows example:

Code:

    EnableExplicit

    Define CenterVertically.I
   
    ;Global f_12.i = LoadFont(#PB_Any,"Calibri Light", 12, #PB_Font_HighQuality)
    Global f_12.i = LoadFont(#PB_Any,"Arial", 12, #PB_Font_HighQuality)
   
    Procedure AlignTextVertically(StringGadgetID, CenterVertically.I)

      Protected ClientRect.RECT
      Protected DCHandle.I
      Protected Text.S = GetGadgetText(StringGadgetID)
      Protected TextXY.SIZE
     
      DCHandle = GetDC_(GadgetID(StringGadgetID))
      SelectObject_(DCHandle, GetGadgetFont(StringGadgetID))
      GetTextExtentPoint32_(DCHandle, Text, Len(Text), @TextXY)
      ReleaseDC_(GadgetID(StringGadgetID), DCHandle)
      GetClientRect_(GadgetID(StringGadgetID), ClientRect)

      If CenterVertically
        ClientRect\top = (ClientRect\bottom - TextXY\cy) / 2 - 1
      EndIf
     
      SendMessage_(GadgetID(StringGadgetID), #EM_SETRECT, 0, ClientRect)
      InvalidateRect_(GadgetID(StringGadgetID), 0, #True)

    EndProcedure

    OpenWindow(0, 270, 100, 330, 200, "Center text vertically")
   
    StringGadget(0, 10, 10, 310, 40, "The quick brown fox jumps over the lazy dog.", #ES_MULTILINE)
   
    StringGadget(1, 10, 60, 310, 40, "The quick brown fox jumps over the lazy dog.", #ES_MULTILINE)
      SetGadgetFont(1, FontID(f_12))
   
    ButtonGadget(2, 70, 110, 180, 25, "Toggle vertical centering")

    Repeat
      Select WaitWindowEvent()
        Case #PB_Event_CloseWindow
          Break
        Case #PB_Event_Gadget
          If EventGadget() = 2
            CenterVertically ! 1
            AlignTextVertically(0, CenterVertically)
            AlignTextVertically(1, CenterVertically)
          EndIf
      EndSelect
    ForEver

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Verticaly center text in string gadget.

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