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pub const CANVAS_CLASS_NAME: &'static str = "NWG_BUILTIN_D2DCANVAS";
use std::hash::Hash;
use std::any::TypeId;
use std::ptr;
use winapi::{HWND, ID2D1Factory, ID2D1HwndRenderTarget};
use ui::Ui;
use controls::{Control, ControlT};
use error::{Error, SystemError};
use events::Event;
use super::{Canvas, CanvasProtected};
pub struct CanvasT<ID: Hash+Clone> {
pub parent: ID,
pub position: (i32, i32),
pub size: (u32, u32),
pub visible: bool,
pub disabled: bool,
}
impl<ID: Hash+Clone+'static> ControlT<ID> for CanvasT<ID> {
fn type_id(&self) -> TypeId { TypeId::of::<Canvas<ID>>() }
fn events(&self) -> Vec<Event> {
vec![Event::Destroyed, Event::KeyDown, Event::KeyUp, Event::Char, Event::MouseDown, Event::MouseUp,
Event::Moved, Event::Resized, Event::Paint, Event::Raw]
}
fn build(&self, ui: &Ui<ID>) -> Result<Box<Control>, Error> {
unsafe{
if let Err(e) = build_sysclass() { return Err(e); }
match build_window(ui, &self) {
Ok((h, (f, r))) => { Ok( Box::new(
Canvas::<ID>::create(h, f, r)
) as Box<Control> ) },
Err(e) => Err(e)
}
}
}
}
use winapi::{UINT, WPARAM, LPARAM, LRESULT};
type RenderOut = (*mut ID2D1Factory, *mut ID2D1HwndRenderTarget);
#[allow(unused_variables)]
unsafe extern "system" fn canvas_sysproc(hwnd: HWND, msg: UINT, w: WPARAM, l: LPARAM) -> LRESULT {
use winapi::{WM_CREATE, WM_CLOSE};
use user32::{DefWindowProcW, ShowWindow};
let handled = match msg {
WM_CREATE => true,
WM_CLOSE => {
ShowWindow(hwnd, 0);
true
}
_ => false
};
if handled {
0
} else {
DefWindowProcW(hwnd, msg, w, l)
}
}
#[inline(always)]
unsafe fn build_sysclass() -> Result<(), Error> {
use low::window_helper::{SysclassParams, build_sysclass};
use winapi::{CS_HREDRAW, CS_VREDRAW};
let params = SysclassParams {
class_name: CANVAS_CLASS_NAME,
sysproc: Some(canvas_sysproc),
background: Some(ptr::null_mut()),
style: Some(CS_HREDRAW | CS_VREDRAW)
};
if let Err(e) = build_sysclass(params) {
Err(Error::System(e))
} else {
Ok(())
}
}
#[inline(always)]
pub unsafe fn build_render_target(hwnd: HWND, factory: &mut ID2D1Factory) -> Result<*mut ID2D1HwndRenderTarget, SystemError> {
use winapi::{S_OK, RECT, D2D_SIZE_U, D2D1_PRESENT_OPTIONS_NONE, D2D1_PIXEL_FORMAT, D2D1_RENDER_TARGET_PROPERTIES,
D2D1_HWND_RENDER_TARGET_PROPERTIES, D2D1_FEATURE_LEVEL_DEFAULT, D2D1_RENDER_TARGET_TYPE_DEFAULT, D2D1_RENDER_TARGET_USAGE_NONE,
DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED};
use user32::GetClientRect;
use std::mem;
let mut rc: RECT = mem::uninitialized();
GetClientRect(hwnd, &mut rc);
let size = D2D_SIZE_U {
width: (rc.right-rc.left) as u32,
height: (rc.bottom-rc.top) as u32
};
let pixel_format = D2D1_PIXEL_FORMAT {
format: DXGI_FORMAT_B8G8R8A8_UNORM,
alphaMode: D2D1_ALPHA_MODE_PREMULTIPLIED
};
let render_props = D2D1_RENDER_TARGET_PROPERTIES {
_type: D2D1_RENDER_TARGET_TYPE_DEFAULT,
pixelFormat: pixel_format,
dpiX: 0.0, dpiY: 0.0,
usage: D2D1_RENDER_TARGET_USAGE_NONE,
minLevel: D2D1_FEATURE_LEVEL_DEFAULT
};
let hwnd_render_props = D2D1_HWND_RENDER_TARGET_PROPERTIES {
hwnd: hwnd,
pixelSize: size,
presentOptions: D2D1_PRESENT_OPTIONS_NONE
};
let mut render_target: *mut ID2D1HwndRenderTarget = ptr::null_mut();
if factory.CreateHwndRenderTarget(&render_props, &hwnd_render_props, &mut render_target) != S_OK {
factory.Release();
let msg = "Could not create render target".to_string();
Err(SystemError::ComError(msg))
} else {
Ok(render_target)
}
}
#[inline(always)]
unsafe fn build_renderer(hwnd: HWND) -> Result<RenderOut, SystemError> {
use winapi::{UuidOfID2D1Factory, D2D1_FACTORY_TYPE_SINGLE_THREADED, S_OK};
use low::defs::D2D1CreateFactory;
let mut factory: *mut ID2D1Factory = ptr::null_mut();
let result = D2D1CreateFactory(
D2D1_FACTORY_TYPE_SINGLE_THREADED,
&UuidOfID2D1Factory,
ptr::null(),
&mut factory
);
if result != S_OK {
let msg = "Could not create D2D1 factory".to_string();
return Err(SystemError::ComError(msg));
}
match build_render_target(hwnd, &mut *factory) {
Ok(render_target) => Ok( (factory, render_target) ),
Err(e) => Err(e)
}
}
#[inline(always)]
unsafe fn build_window<ID: Hash+Clone>(ui: &Ui<ID>, t: &CanvasT<ID>) -> Result<(HWND, RenderOut), Error> {
use low::window_helper::{WindowParams, build_window, handle_of_window};
use winapi::{DWORD, WS_VISIBLE, WS_DISABLED, WS_CHILD};
use user32::DestroyWindow;
let flags: DWORD = WS_CHILD |
if t.visible { WS_VISIBLE } else { 0 } |
if t.disabled { WS_DISABLED } else { 0 };
let parent = match handle_of_window(ui, &t.parent, "The parent of a canvas must be a window-like control.") {
Ok(h) => h,
Err(e) => { return Err(e); }
};
let params = WindowParams {
title: "",
class_name: CANVAS_CLASS_NAME,
position: t.position.clone(),
size: t.size.clone(),
flags: flags,
ex_flags: None,
parent: parent
};
let handle = match build_window(params) {
Ok(h) => h,
Err(e) => { return Err(Error::System(e)); }
};
let renderer = match build_renderer(handle) {
Ok(r) => r,
Err(e) => {
DestroyWindow(handle);
{ return Err(Error::System(e)); }
}
};
Ok((handle, renderer))
}