GM_TEXTEDITOR_AddChangeListener
Post date
Sun, 02/25/2024 - 05:45
Someone posted a thread on EAB asking how to get GM_TEXTEDITOR_AddChangeListener working. They managed to do it and I asked how they did it and I got no reply so I'll ask here.
I tried to get this working for myself and I am unable. It just crashes when I try to add the change listener.
printf("Char entered: %c\n", character);
}
struct ChangeListener *textInputChangeListener;
struct Object *textInputTextEditor;
void openGUI() {
// Code that creates the gadgets and opens the window is above but omitted in this forum post
textInputChangeListener = AllocVec(sizeof(struct ChangeListener), MEMF_CLEAR);
textInputChangeListener->onCharEntered = something;
DoGadgetMethod(textInputTextEditor, mainWindow, NULL, GM_TEXTEDITOR_AddChangeListener, textInputChangeListener, NULL);
// The system has now crashed
}
Post date
Monday, February 26, 2024 - 06:54
@nightfox - my code is all assembler and as such uses a bunch of my assembler "idioms" to get stuff done! Happy to provide code snippets if you really want to see how I did it. However, @boemann's advice above is spot on. You effectively need to pass the address of a function/routine that conforms to ChangeListener. In my case, it's just a pointer to some code that sets a flag and enables a save button.
Online Status
Hi
If you look at the GP_TEXTEDITOR_AddChangeListener you will see it is not a gadget method so it should be installed like this:
DoMethod(textInputTextEditor, GM_TEXTEDITOR_AddChangeListener, listener, NULL);
Additionally you should note that the "something" function likely takes the arguments in A0 and D0.
I say likely as it unfortunately is underspecified, so please experiment a bit with the arguments