53 lines
1.7 KiB
Zig
53 lines
1.7 KiB
Zig
//! The platform is the main interface to be implemnted by backends. It's responsible for driving
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//! the GUI by sending treevents and rendering the GUI.
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const std = @import("std");
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const statspatch = @import("statspatch");
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const zenolith = @import("main.zig");
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const Backevent = @import("backevent.zig").Backevent;
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const Widget = @import("widget.zig").Widget;
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fn Prototype(comptime Self: type) type {
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std.debug.assert(Self == Platform);
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return struct {
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/// Called when a widget subtree is unlinked on this platform.
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/// Do not call this directly, instead call Widget.unlink.
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pub fn onSubtreeUnlink(self: *Self, widget: *Widget) !void {
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try @as(anyerror!void, statspatch.implcallOptional(
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self,
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.ptr,
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"onSubtreeUnlink",
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anyerror!void,
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.{ self, widget },
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) orelse {});
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if (self.data.focused_widget) |foc| {
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if (widget == foc or widget.isChildOf(foc)) {
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self.data.focused_widget = null;
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}
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}
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}
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/// Do a layout pass on a given widget. The passed widget is asserted to be a root widget of
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/// this platform.
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pub fn relayoutRoot(self: *Self, root: *Widget) !void {
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try statspatch.implcall(
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self,
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.ptr,
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"relayoutRoot",
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anyerror!void,
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.{ root },
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);
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}
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};
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}
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pub const PlatformData = struct {
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/// The widget currently being focused, or null if no widget is in focus.
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focused_widget: ?*Widget = null,
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};
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pub const Platform = statspatch.StatspatchType(Prototype, PlatformData, &zenolith.platform_impls);
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