digitalmars.D.learn - How to change button text color in NM

digitalmars.D.learn - How to change button text color in NM_CUSTOMDRAW (Win32 API question)

Vinod K Chandran (25/25) Mar 16 2021 Hi all,

Imperatorn (2/11) Mar 16 2021 Omg the pain. Are you forced to use raw win api for this?

Vinod K Chandran (3/4) Mar 16 2021 Not at all. It's my hobby project. I choose raw win api. It's a

Imperatorn (3/8) Mar 16 2021 I see 😁

Vinod K Chandran (12/14) Mar 16 2021 As far as i know this is the value of CLR_INVALID - 4294967295.
Vinod K Chandran (11/13) Mar 16 2021 That results might be wrong. So i printed them in hex. These are

Imperatorn (3/17) Mar 16 2021 Some info here

Vinod K Chandran (9/12) Mar 16 2021 On Tuesday, 16 March 2021 at 19:42:26 UTC, Imperatorn wrote:

Imperatorn (5/18) Mar 16 2021 Good that you solved it, that wasn't what I thought the solution

Vinod K Chandran (17/20) Mar 17 2021 I was sure about i can solve this through NM_CUSTOMDRAW. Because,

Vinod K Chandran (7/9) Mar 16 2021 From that results, second one contains my color value.

Jack (4/29) Mar 16 2021 I'm afraid you have to do everything yourself, including draw the

Vinod K Chandran <kcvinu82 gmail.com> writes:

Hi all,
I am creating a Button class with Win32 API functions. So far so 
good. I am using NM_CUSTOMDRAW message to change the back color 
of my buttons. It's really easy to change the back color in this 
way. But I can't change the text color of my button. This is my 
pseudo code.
```
uint setBtnBackColor( LPNMCUSTOMDRAW  lp) {

     SetTextColor(lp.hdc, RGB(102, 255, 51) )    // Not working

     if lp.uItemState & CDIS_SELECTED { //----------- btn clicked
         // Change back color using SelectObject & FillRect
         // Its Working. No probs.
         }
     elseif lp.uItemState & CDIS_HOT { //------------Mouse over
         // Change back color using SelectObject & FillRect
         // Its Working. No probs.
         }
     else { // ---------Default state of button
          // Change back color using SelectObject & FillRect
         // Its Working. No probs.
         }
     return CDRF_SKIPDEFAULT
}
```
What is wrong in my approach ?

Mar 16 2021

Imperatorn <johan_forsberg_86 hotmail.com> writes:

On Tuesday, 16 March 2021 at 17:26:01 UTC, Vinod K Chandran wrote:
 Hi all,
 I am creating a Button class with Win32 API functions. So far 
 so good. I am using NM_CUSTOMDRAW message to change the back 
 color of my buttons. It's really easy to change the back color 
 in this way. But I can't change the text color of my button. 
 This is my pseudo code.
 ```
 uint setBtnBackColor( LPNMCUSTOMDRAW  lp) {

 [...]

Omg the pain. Are you forced to use raw win api for this?

Mar 16 2021

Vinod K Chandran <kcvinu82 gmail.com> writes:

On Tuesday, 16 March 2021 at 17:45:09 UTC, Imperatorn wrote:

 Omg the pain. Are you forced to use raw win api for this?

Not at all. It's my hobby project. I choose raw win api. It's a 
fun.

Mar 16 2021

Imperatorn <johan_forsberg_86 hotmail.com> writes:

On Tuesday, 16 March 2021 at 18:27:54 UTC, Vinod K Chandran wrote:
 On Tuesday, 16 March 2021 at 17:45:09 UTC, Imperatorn wrote:

 Omg the pain. Are you forced to use raw win api for this?

 Not at all. It's my hobby project. I choose raw win api. It's a 
 fun.

I see 😁

Do you get CLR_INVALID in return?

Mar 16 2021

Vinod K Chandran <kcvinu82 gmail.com> writes:

On Tuesday, 16 March 2021 at 18:35:00 UTC, Imperatorn wrote:

 I see 😁

 Do you get CLR_INVALID in return?

As far as i know this is the value of CLR_INVALID - 4294967295.
And these are the results i got from my function.

Set Text color result - 0
Set Text color result - 36962150

Set Text color result - -1
Set Text color result - 0
Set Text color result - 36962150
Set Text color result - 0
Set Text color result - 36962150

The first two results got when the form shown. Rest are the 
results of a mouse hover.

Mar 16 2021

Vinod K Chandran <kcvinu82 gmail.com> writes:

On Tuesday, 16 March 2021 at 18:35:00 UTC, Imperatorn wrote:

 I see 😁

 Do you get CLR_INVALID in return?

That results might be wrong. So i printed them in hex. These are 
the hex results.
Set Text color result - 00000000
Set Text color result - 0233FF66

Set Text color result - FFFFFFFF
Set Text color result - 00000000
Set Text color result - 0233FF66
Set Text color result - 00000000
Set Text color result - 0233FF66

Look, the third one is CLR_INVALID.

Mar 16 2021

Imperatorn <johan_forsberg_86 hotmail.com> writes:

On Tuesday, 16 March 2021 at 19:15:02 UTC, Vinod K Chandran wrote:
 On Tuesday, 16 March 2021 at 18:35:00 UTC, Imperatorn wrote:

 I see 😁

 Do you get CLR_INVALID in return?

 That results might be wrong. So i printed them in hex. These 
 are the hex results.
 Set Text color result - 00000000
 Set Text color result - 0233FF66

 Set Text color result - FFFFFFFF
 Set Text color result - 00000000
 Set Text color result - 0233FF66
 Set Text color result - 00000000
 Set Text color result - 0233FF66

 Look, the third one is CLR_INVALID.

Some info here
https://stackoverflow.com/questions/1525669/set-static-text-color-win32/1526240

Mar 16 2021

Vinod K Chandran <kcvinu82 gmail.com> writes:

On Tuesday, 16 March 2021 at 19:42:26 UTC, Imperatorn wrote:


At last, i found the answer myself. There is a  item called 
dwDrawStage in NMCUSTOMDRAW structure. If  value of dwDrawStage 
is equal to CDDS_PREERASE, call SetBkMode with transparent and 
call SetTextColor. Then draw text  with DrawText function. And 
finally, return CDRF_NOTIFYPOSTPAINT.  In short, do the color 
changing process in pre-erase stage and return 
CDRF_NOTIFYPOSTPAINT constant. As per MSDN, What this constant 
means  is,
 The control will notify the parent after painting an item. 
 This occurs when the dwDrawStage of the NMCUSTOMDRAW 
 structure equals CDDS_PREPAINT.

Mar 16 2021

Imperatorn <johan_forsberg_86 hotmail.com> writes:

On Wednesday, 17 March 2021 at 00:51:05 UTC, Vinod K Chandran 
wrote:
 On Tuesday, 16 March 2021 at 19:42:26 UTC, Imperatorn wrote:


 At last, i found the answer myself. There is a  item called 
 dwDrawStage in NMCUSTOMDRAW structure. If  value of dwDrawStage 
 is equal to CDDS_PREERASE, call SetBkMode with transparent and 
 call SetTextColor. Then draw text  with DrawText function. And 
 finally, return CDRF_NOTIFYPOSTPAINT.  In short, do the color 
 changing process in pre-erase stage and return 
 CDRF_NOTIFYPOSTPAINT constant. As per MSDN, What this constant 
 means  is,
 The control will notify the parent after painting an item. 
 This occurs when the dwDrawStage of the NMCUSTOMDRAW 
 structure equals CDDS_PREPAINT.




Good that you solved it, that wasn't what I thought the solution 
would be 👀

Was more than 10 years ago since I was "the king of win api" 😔

Mar 16 2021

Vinod K Chandran <kcvinu82 gmail.com> writes:

On Wednesday, 17 March 2021 at 06:39:26 UTC, Imperatorn wrote:
 Good that you solved it, that wasn't what I thought the 
 solution would be 👀

I was sure about i can solve this through NM_CUSTOMDRAW. Because, 
in VB .net, we can change back color & fore color of button. On 
the same time, there is an option to turn on the OwnerDrawStyle. 
If we set this property true, we need to draw the button on our 
own. So i am pretty sure that, that property will turn a normal 
button to an owner drawn button. But if we don't use that 
property, then also we can change the button colors. So that 
means, without using BS_OWNERDRAW style, we can change the 
colors. And that's the NM_CUSTOMDRAW message. Unfortunately, 
there is not much tutorials or documentation about handling this 
message in a Button's case. We can find some examples and 
articles related to ListView & Treeview. But not a single line of 
documentation about buttons.

 Was more than 10 years ago since I was "the king of win api" 😔

Glad to know that. Can you write an article about how to use Gdi+ 
in win api apps ? Now I am using gdi. But i want to test how gdi+ 
works on win32 apps.

Mar 17 2021

Vinod K Chandran <kcvinu82 gmail.com> writes:

On Tuesday, 16 March 2021 at 18:35:00 UTC, Imperatorn wrote:
 I see 😁

 Do you get CLR_INVALID in return?

 From that results, second one contains my color value.
Set Text color result - 0233FF66
RGB(102, 255, 51) is the color.
66 = 102
FF = 255
33 = 51

Mar 16 2021

Jack <jckj33 gmail.com> writes:

On Tuesday, 16 March 2021 at 17:26:01 UTC, Vinod K Chandran wrote:
 Hi all,
 I am creating a Button class with Win32 API functions. So far 
 so good. I am using NM_CUSTOMDRAW message to change the back 
 color of my buttons. It's really easy to change the back color 
 in this way. But I can't change the text color of my button. 
 This is my pseudo code.
 ```
 uint setBtnBackColor( LPNMCUSTOMDRAW  lp) {

     SetTextColor(lp.hdc, RGB(102, 255, 51) )    // Not working

     if lp.uItemState & CDIS_SELECTED { //----------- btn clicked
         // Change back color using SelectObject & FillRect
         // Its Working. No probs.
         }
     elseif lp.uItemState & CDIS_HOT { //------------Mouse over
         // Change back color using SelectObject & FillRect
         // Its Working. No probs.
         }
     else { // ---------Default state of button
          // Change back color using SelectObject & FillRect
         // Its Working. No probs.
         }
     return CDRF_SKIPDEFAULT
 }
 ```
 What is wrong in my approach ?

I'm afraid you have to do everything yourself, including draw the 
text and call SetTextColor() on the associated HDC (that you have 
used in the DrawText() for exe)

Mar 16 2021

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digitalmars.D.learn - How to change button text color in NM_CUSTOMDRAW (Win32 API question)