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Pan image::Viewer even if the cursor is out of bounds

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This commit is contained in:
Héctor Ramón Jiménez 2020-12-18 10:47:29 +01:00
parent 21b10dc103
commit add167d6a0
1 changed files with 66 additions and 75 deletions
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141
native/src/widget/image/viewer.rs
View File

@ -215,92 +215,83 @@ where
let bounds = layout.bounds();
let is_mouse_over = bounds.contains(cursor_position);
if is_mouse_over {
match event {
Event::Mouse(mouse::Event::WheelScrolled { delta }) => {
match delta {
mouse::ScrollDelta::Lines { y, .. }
| mouse::ScrollDelta::Pixels { y, .. } => {
let previous_scale =
self.state.scale.unwrap_or(1.0);
match event {
Event::Mouse(mouse::Event::WheelScrolled { delta })
if is_mouse_over =>
{
match delta {
mouse::ScrollDelta::Lines { y, .. }
| mouse::ScrollDelta::Pixels { y, .. } => {
let previous_scale = self.state.scale.unwrap_or(1.0);
if y < 0.0 && previous_scale > self.min_scale
|| y > 0.0 && previous_scale < self.max_scale
{
self.state.scale = Some(
(if y > 0.0 {
self.state.scale.unwrap_or(1.0)
* (1.0 + self.scale_pct)
} else {
self.state.scale.unwrap_or(1.0)
/ (1.0 + self.scale_pct)
})
.max(self.min_scale)
.min(self.max_scale),
);
if y < 0.0 && previous_scale > self.min_scale
|| y > 0.0 && previous_scale < self.max_scale
{
self.state.scale = Some(
(if y > 0.0 {
self.state.scale.unwrap_or(1.0)
* (1.0 + self.scale_pct)
} else {
self.state.scale.unwrap_or(1.0)
/ (1.0 + self.scale_pct)
})
.max(self.min_scale)
.min(self.max_scale),
);
let image_size =
self.image_size(renderer, bounds.size());
let image_size =
self.image_size(renderer, bounds.size());
let factor = self.state.scale.unwrap()
/ previous_scale
- 1.0;
let factor = self.state.scale.unwrap()
/ previous_scale
- 1.0;
let cursor_to_center =
relative_cursor_position(
cursor_position,
bounds,
) - relative_center(bounds);
let cursor_to_center = relative_cursor_position(
cursor_position,
bounds,
) - relative_center(bounds);
let adjustment = cursor_to_center * factor
+ self.state.current_offset * factor;
let adjustment = cursor_to_center * factor
+ self.state.current_offset * factor;
self.state.current_offset = Vector::new(
if image_size.width > bounds.width {
self.state.current_offset.x
+ adjustment.x
} else {
0.0
},
if image_size.height > bounds.height {
self.state.current_offset.y
+ adjustment.y
} else {
0.0
},
);
}
self.state.current_offset = Vector::new(
if image_size.width > bounds.width {
self.state.current_offset.x + adjustment.x
} else {
0.0
},
if image_size.height > bounds.height {
self.state.current_offset.y + adjustment.y
} else {
0.0
},
);
}
}
}
Event::Mouse(mouse::Event::ButtonPressed(button)) => {
if button == mouse::Button::Left {
self.state.starting_cursor_pos = Some(cursor_position);
self.state.starting_offset = self.state.current_offset;
}
}
Event::Mouse(mouse::Event::ButtonReleased(button)) => {
if button == mouse::Button::Left {
self.state.starting_cursor_pos = None
}
}
Event::Mouse(mouse::Event::CursorMoved { position }) => {
if self.state.is_cursor_clicked() {
let image_size =
self.image_size(renderer, bounds.size());
self.state
.pan(position.x, position.y, bounds, image_size);
}
}
_ => {}
}
} else if let Event::Mouse(mouse::Event::ButtonReleased(button)) = event
{
if button == mouse::Button::Left {
self.state.starting_cursor_pos = None;
Event::Mouse(mouse::Event::ButtonPressed(button))
if is_mouse_over =>
{
if button == mouse::Button::Left {
self.state.starting_cursor_pos = Some(cursor_position);
self.state.starting_offset = self.state.current_offset;
}
}
Event::Mouse(mouse::Event::ButtonReleased(button)) => {
if button == mouse::Button::Left {
self.state.starting_cursor_pos = None
}
}
Event::Mouse(mouse::Event::CursorMoved { position }) => {
if self.state.is_cursor_clicked() {
let image_size = self.image_size(renderer, bounds.size());
self.state.pan(position.x, position.y, bounds, image_size);
}
}
_ => {}
}
event::Status::Ignored