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Added 'SetScrollHereX' and 'SetScrollFromPosX' (#1580)

This commit is contained in:
kevreco 2018-01-30 21:51:28 +01:00 committed by omar
parent 2a3517a399
commit caf119a982
2 changed files with 27 additions and 1 deletions
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26
imgui.cpp
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@ -4841,7 +4841,12 @@ static ImVec2 CalcNextScrollFromScrollTargetAndClamp(ImGuiWindow* window, bool s
if (window->ScrollTarget.x < FLT_MAX)
{
float cr_x = window->ScrollTargetCenterRatio.x;
scroll.x = window->ScrollTarget.x - cr_x * window->InnerRect.GetWidth();
float target_x = window->ScrollTarget.x;
if (snap_on_edges && cr_x <= 0.0f && target_x <= window->WindowPadding.x)
target_x = 0.0f;
else if (snap_on_edges && cr_x >= 1.0f && target_x >= window->ContentSize.x + window->WindowPadding.x + GImGui->Style.ItemSpacing.x)
target_x = window->ContentSize.x + window->WindowPadding.x * 2.0f;
scroll.x = target_x - cr_x * window->InnerRect.GetWidth();
}
if (window->ScrollTarget.y < FLT_MAX)
{
@ -6861,6 +6866,25 @@ void ImGui::SetScrollFromPosY(float local_y, float center_y_ratio)
window->ScrollTargetCenterRatio.y = center_y_ratio;
}
void ImGui::SetScrollFromPosX(float local_x, float center_x_ratio)
{
// We store a target position so centering can occur on the next frame when we are guaranteed to have a known window size
ImGuiWindow* window = GetCurrentWindow();
IM_ASSERT(center_x_ratio >= 0.0f && center_x_ratio <= 1.0f);
window->ScrollTarget.x = (float)(int)(local_x + window->Scroll.x);
window->ScrollTargetCenterRatio.x = center_x_ratio;
}
// center_x_ratio: 0.0f left of last item, 0.5f horizontal center of last item, 1.0f right of last item.
void ImGui::SetScrollHereX(float center_x_ratio)
{
ImGuiWindow* window = GetCurrentWindow();
float target_x = window->DC.LastItemRect.Min.x - window->Pos.x; // Left of last item, in window space
float last_item_width = window->DC.LastItemRect.GetWidth();
target_x += (last_item_width * center_x_ratio) + (GImGui->Style.ItemSpacing.x * (center_x_ratio - 0.5f) * 2.0f); // Precisely aim before, in the middle or after the last item.
SetScrollFromPosX(target_x, center_x_ratio);
}
// center_y_ratio: 0.0f top of last item, 0.5f vertical center of last item, 1.0f bottom of last item.
void ImGui::SetScrollHereY(float center_y_ratio)
{

2
imgui.h
View File

@ -302,7 +302,9 @@ namespace ImGui
IMGUI_API float GetScrollMaxY(); // get maximum scrolling amount ~~ ContentSize.Y - WindowSize.Y
IMGUI_API void SetScrollX(float scroll_x); // set scrolling amount [0..GetScrollMaxX()]
IMGUI_API void SetScrollY(float scroll_y); // set scrolling amount [0..GetScrollMaxY()]
IMGUI_API void SetScrollHereX(float center_x_ratio = 0.5f); // adjust scrolling amount to make current cursor position visible. center_x_ratio=0.0: left, 0.5: center, 1.0: right. When using to make a "default/current item" visible, consider using SetItemDefaultFocus() instead.
IMGUI_API void SetScrollHereY(float center_y_ratio = 0.5f); // adjust scrolling amount to make current cursor position visible. center_y_ratio=0.0: top, 0.5: center, 1.0: bottom. When using to make a "default/current item" visible, consider using SetItemDefaultFocus() instead.
IMGUI_API void SetScrollFromPosX(float local_x, float center_x_ratio = 0.5f); // adjust scrolling amount to make given position visible. Generally GetCursorStartPos() + offset to compute a valid position.
IMGUI_API void SetScrollFromPosY(float local_y, float center_y_ratio = 0.5f); // adjust scrolling amount to make given position visible. Generally GetCursorStartPos() + offset to compute a valid position.
// Parameters stacks (shared)