如何向 GtkMM 中的自定义 Widget 添加 ScrolledWindow 支持？
我正在为 Gtkmm 编写一个自定义小部件，它应该显示一个巨大的数据集（想象一下类似 4096x256 字符数据表的东西）。
主要是出于优雅的原因，但也是为了在 Glade/Gtk-Builder 编辑器中可能使用，我希望这个小部件原生支持 ScrolledWindow，也就是说，一旦将其设置为 ScrolledWindow 的子项，它就会被识别为可滚动小部件，允许在其上设置水平和垂直调整对象，随后可以对其进行篡改。
似乎是这样做的，我需要在我的小部件的构造函数中执行类似的操作：
// get Gtk C type from wrapper class
GtkWidget* gwidget = this->gobj();
// imagine code here that magically creates a gobject signal,
// that we can catch in C++.
// this is actually the part which I don't know how to do.
guint my_signal = magic_way_to_create_this_signal(
&MyClass::rainbow_unicorn_signal_handler);
// make ScrolledWindow recognize this window as scrollable
GTK_WIDGET_GET_CLASS(gwidget)->set_scroll_adjustments_signal = my_signal;
稍后，添加小部件时 ScrolledWindow 发出的信号需要由我的小部件通过信号代理方法或其他方法捕获？我不知道。
我该怎么做？
I am writing a custom widget for Gtkmm that is supposed to display a huge dataset (imagine something like a 4096x256 character datasheet).
Mostly for reasons of elegance, but also for a possible usage in a Glade/Gtk-Builder editor, I want this widget to support ScrolledWindow natively, that is, once it is set as the child of ScrolledWindow, it is recognized as a scrollable widget, allowing to set horizontal and vertical Adjustment objects on it, which it can subsequently tamper with.
It appears to do so, I need to do something like this in the constructor of my widget:
// get Gtk C type from wrapper class
GtkWidget* gwidget = this->gobj();
// imagine code here that magically creates a gobject signal,
// that we can catch in C++.
// this is actually the part which I don't know how to do.
guint my_signal = magic_way_to_create_this_signal(
&MyClass::rainbow_unicorn_signal_handler);
// make ScrolledWindow recognize this window as scrollable
GTK_WIDGET_GET_CLASS(gwidget)->set_scroll_adjustments_signal = my_signal;
Later on, the signal emitted by ScrolledWindow when the widget is added needs to be caught by my Widget through a signal proxy method or something? I have no idea.
How can I do this?
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“
magic_way_to_create_this_signal”是g_signal_new()。您可以在小部件的my_widget_class_init()函数中调用它，该函数是定义类的 GObject 方式的一部分。我不太确定 Gtkmm 中的等价物是什么。另请参阅 GTK 文档中的脚注，其中这解释了为什么让一个小部件本身可滚动是如此麻烦。
您还可以将您的小部件放入
Gtk::Viewport为其子小部件添加滚动功能。The '
magic_way_to_create_this_signal' isg_signal_new(). You call it in your widget'smy_widget_class_init()function which is part of the GObject way of defining a class. I'm not exactly sure what the equivalent is in Gtkmm.See also the footnote in the GTK docs, where it is explained why making a widget natively scrollable is such a hassle.
You could also put your widget into a
Gtk::Viewportwhich adds scrolling capabilities to its child widget.