Re: Format
On Saturday, 22 May 2021 at 03:14:35 UTC, cc wrote:
Oops, disregard this. I had an error in my imports.😓
It does in fact work in @safe.
I should add as an aside then that there is an issue of errors
from the body of a toString template not being displayed, and
instead the template being silently skipped, e.g.:
```d
@safe void toString(W)(ref W writer) if (isOutputRange!(W, char))
{
writer.formattedWrite("FOO:%s", x);
syntactically correct; // Program will compile without error,
but this function will now never be called
}
```
I ran into a similar challenge with opDispatch some time ago:
https://forum.dlang.org/post/axgwhzzawncbpcvqq...@forum.dlang.org
In this case I assume it's some consequence of NOT wanting to
emit a warning or error for every single class or struct that
doesn't have a templated toString when the various output writers
go looking for one.
Something like this can help reveal errors, not sure if there's
an easier way:
```d
unittest {
struct DebugWriter {
void put(C)(C c) {}
}
DebugWriter wr;
Foo foo;
foo.toString(wr);
}
```
`Error: undefined identifier 'syntactically'`
`Error: template instance
'amemfailuretest.Foo.toString!(DebugWriter)' error instantiating`
Re: Format
On Saturday, 22 May 2021 at 03:07:10 UTC, cc wrote:
Ahh, in that case it would appear formattedWrite isn't @safe at
all. Looks like you have to stick with put()?
```d
@safe void toString(W)(ref W writer) if (isOutputRange!(W,
char)) {
//writer.formattedWrite!("FOO:%s", x); // fails
import std.conv;
put(writer, "FOO:");
put(writer, x.to!string);
}
```
Oops, disregard this. I had an error in my imports.😓
It does in fact work in @safe.
Re: Format
On Friday, 21 May 2021 at 16:53:48 UTC, drug wrote:
21.05.2021 18:28, cc пишет:
On Friday, 21 May 2021 at 14:19:03 UTC, newbie wrote:
Thank you, and formatValue?
formattedWrite should handle this.
```d
@safe struct Foo {
int x = 3;
void toString(W)(ref W writer) if (isOutputRange!(W,
char)) {
   writer.formattedWrite("Foo(%s)", x);
}
}
Foo foo;
writeln(foo);
```
Oddly enough this form of toString works from @safe code even
if it's not marked @safe, or even marked @system...
I guess that because it is a template so the compiler is able
to deduce its attributes. What about the case when it is marked
@system - in this case compiler ignore that method due to the
fact that it is @system and generate the default one. Because
your implementation of the method is equal to the default
implementation you didn't see the difference but it exists. Try
to make your implementation of `toString` different and you'll
see.
Ahh, in that case it would appear formattedWrite isn't @safe at
all. Looks like you have to stick with put()?
```d
@safe void toString(W)(ref W writer) if (isOutputRange!(W, char))
{
//writer.formattedWrite!("FOO:%s", x); // fails
import std.conv;
put(writer, "FOO:");
put(writer, x.to!string);
}
```
Re: Formatted output not on screen but in a string
On Friday, 21 May 2021 at 22:37:34 UTC, Alain De Vos wrote: Next code format a string and prints it. But I want the formatted string stored in a string ``` //Decimal place separator %, writefln!"%,s"(123456789); //123,456,789 ``` std.format.format
Formatted output not on screen but in a string
Next code format a string and prints it. But I want the formatted string stored in a string ``` //Decimal place separator %, writefln!"%,s"(123456789); //123,456,789 ```
Re: gtkd , addondraw is deprecated
On 21-05-2021 12:35, Alain De Vos wrote:
What is the advised function to use instead of
gtk.Widget.Widget.addOnDraw ?
```
this()
   { addOnDraw(&drawCallback);}
```
Change the `Context` passed to the drawCallback to a `Scoped!Context`
only the non scoped overload is deprecated.
```
bool drawCallback(Scoped!Context cr, Widget widget)
```
--
Mike Wey
Re: Format
On Friday, 21 May 2021 at 14:19:03 UTC, newbie wrote:
Thank you, and formatValue?
formattedWrite should handle this.
```d
@safe struct Foo {
int x = 3;
void toString(W)(ref W writer) if (isOutputRange!(W, char)) {
writer.formattedWrite("Foo(%s)", x);
}
}
Foo foo;
writeln(foo);
```
Oddly enough this form of toString works from @safe code even if
it's not marked @safe, or even marked @system...
Re: Format
On Friday, 21 May 2021 at 13:59:13 UTC, drug wrote:
21.05.2021 16:45, newbie пишет:
I am following
https://wiki.dlang.org/Defining_custom_print_format_specifiers, why sink and formatValue are not @safe? What are the best practice for toString in safe code? Thank you
sink is obsolete now, use W(riter)
```D
import std.range : isOutputRange;
void toString(W)(ref W writer) const
if (isOutputRange!(W, char))
{
// your stuff
}
```
writer can be @safe, @nogc, nothrow etc like you want
Thank you, and formatValue?
Re: Format
21.05.2021 16:45, newbie пишет:
I am following
https://wiki.dlang.org/Defining_custom_print_format_specifiers, why sink
and formatValue are not @safe? What are the best practice for toString
in safe code? Thank you
sink is obsolete now, use W(riter)
```D
import std.range : isOutputRange;
void toString(W)(ref W writer) const
if (isOutputRange!(W, char))
{
// your stuff
}
```
writer can be @safe, @nogc, nothrow etc like you want
Format
I am following https://wiki.dlang.org/Defining_custom_print_format_specifiers, why sink and formatValue are not @safe? What are the best practice for toString in safe code? Thank you
Re: gtkd ,drawingarea, capture mouse pressed
I found something, https://api.gtkd.org/gdk.Event.Event.getCoords.html
Re: gtkd ,drawingarea, capture mouse pressed
21.05.2021 15:39, Alain De Vos пишет:
I'll have a look at that website.
With this code I capture the mouse press event
```
this()
{
addEvents(GdkEventMask.BUTTON_PRESS_MASK);
addOnDraw(&drawCallback);
addOnButtonPress(&onButtonPress);
}
```
```
public bool onButtonPress(Event event, Widget widget)
{
writeln("Button pressed");
return false;
}
```
But I still need the coordinates of pointer.
I'm not gtk user too but you could try to use
GdkEventMask.BUTTON_MOTION_MASK to get pointer
motion events while some button is pressed
Re: gtkd ,drawingarea, capture mouse pressed
I'll have a look at that website.
With this code I capture the mouse press event
```
this()
{
addEvents(GdkEventMask.BUTTON_PRESS_MASK);
addOnDraw(&drawCallback);
addOnButtonPress(&onButtonPress);
}
```
```
public bool onButtonPress(Event event, Widget widget)
{
writeln("Button pressed");
return false;
}
```
But I still need the coordinates of pointer.
Re: gtkd ,drawingarea, capture mouse pressed
On Friday, 21 May 2021 at 12:28:36 UTC, Alain De Vos wrote: On a gtkd drawingarea I want to capture the mouse-pressed event and get the coordinates of the pointer on the area. I have ``` addEvents(GdkEventMask.BUTTON_PRESS_MASK); ``` Maybe I must add a signal-handler ? Not a gtk user, but maybe this will help (has quite a list of examples on gtkd, newest first) https://gtkdcoding.com/
gtkd ,drawingarea, capture mouse pressed
On a gtkd drawingarea I want to capture the mouse-pressed event and get the coordinates of the pointer on the area. I have ``` addEvents(GdkEventMask.BUTTON_PRESS_MASK); ``` Maybe I must add a signal-handler ?
gtkd , addondraw is deprecated
What is the advised function to use instead of
gtk.Widget.Widget.addOnDraw ?
```
this()
{ addOnDraw(&drawCallback);}
```
