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[feat] add support for server window resizing and dragging

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This commit is contained in:
dijunkun
2026-01-20 01:22:14 +08:00
parent fd242d50c1
commit f6e169c013
4 changed files with 145 additions and 184 deletions
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192
src/gui/windows/server_window.cpp
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@@ -1,110 +1,95 @@
#include <cmath>
#include <vector>
#include "rd_log.h"
#include "render.h"
namespace crossdesk {
static void SetServerWindowCircleShape(SDL_Window* window, int diameter) {
if (!window || diameter <= 0) {
namespace {
constexpr float kDragThresholdPx = 3.0f;
// Handles dragging for the *last submitted ImGui item*.
// `reset_on_deactivate` should be false when the caller needs to know whether a
// deactivation was a click (no drag) vs a drag-release (dragging==true).
inline void HandleWindowDragForLastItem(SDL_Window* window, bool& dragging,
float& start_mouse_x,
float& start_mouse_y, int& start_win_x,
int& start_win_y,
bool reset_on_deactivate = true) {
if (!window) {
return;
}
const int pitch = diameter * 4;
std::vector<unsigned char> pixels((size_t)diameter * (size_t)diameter * 4, 0);
if (ImGui::IsItemActivated()) {
SDL_GetGlobalMouseState(&start_mouse_x, &start_mouse_y);
SDL_GetWindowPosition(window, &start_win_x, &start_win_y);
dragging = false;
}
// Sub-pixel centered circle helps symmetry on even diameters.
const float r = (float)diameter * 0.5f;
const float cx = r - 0.5f;
const float cy = r - 0.5f;
if (ImGui::IsItemActive()) {
if (!dragging &&
ImGui::IsMouseDragging(ImGuiMouseButton_Left, kDragThresholdPx)) {
dragging = true;
}
for (int y = 0; y < diameter; ++y) {
for (int x = 0; x < diameter; ++x) {
const float dx = (float)x - cx;
const float dy = (float)y - cy;
const float dist = std::sqrt(dx * dx + dy * dy);
// 1px soft edge to reduce jaggies on small circles.
float a = r + 0.5f - dist;
if (a < 0.0f) a = 0.0f;
if (a > 1.0f) a = 1.0f;
const unsigned char alpha = (unsigned char)(a * 255.0f);
const size_t idx = ((size_t)y * (size_t)diameter + (size_t)x) * 4;
pixels[idx + 0] = 255; // R
pixels[idx + 1] = 255; // G
pixels[idx + 2] = 255; // B
pixels[idx + 3] = alpha; // A
if (dragging) {
float mouse_x = 0.0f;
float mouse_y = 0.0f;
SDL_GetGlobalMouseState(&mouse_x, &mouse_y);
const int dx = (int)(mouse_x - start_mouse_x);
const int dy = (int)(mouse_y - start_mouse_y);
SDL_SetWindowPosition(window, start_win_x + dx, start_win_y + dy);
}
}
SDL_Surface* shape = SDL_CreateSurfaceFrom(
diameter, diameter, SDL_PIXELFORMAT_RGBA32, pixels.data(), pitch);
if (!shape) {
LOG_ERROR("SDL_CreateSurfaceFrom failed: {}", SDL_GetError());
return;
if (reset_on_deactivate && ImGui::IsItemDeactivated()) {
dragging = false;
}
if (!SDL_SetWindowShape(window, shape)) {
LOG_ERROR("SDL_SetWindowShape failed: {}", SDL_GetError());
}
SDL_DestroySurface(shape);
}
} // namespace
int Render::ServerWindow() {
ImGui::SetNextWindowSize(ImVec2(server_window_width_, server_window_height_),
ImGuiCond_Always);
ImGui::SetNextWindowPos(ImVec2(0, 0), ImGuiCond_Always);
if (server_window_compact_) {
ImGui::SetNextWindowBgAlpha(0.0f);
}
ImGui::Begin("##server_window", nullptr,
ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize |
ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoCollapse |
ImGuiWindowFlags_NoScrollbar |
ImGuiWindowFlags_NoScrollWithMouse);
// Compact mode: show a 50x50 clickable square that restores the window.
if (server_window_compact_) {
ImDrawList* draw_list = ImGui::GetWindowDrawList();
// Collapsed mode: no buttons; drag to move; click to restore.
if (server_window_collapsed_) {
ImGui::SetCursorPos(ImVec2(0.0f, 0.0f));
if (ImGui::InvisibleButton(
"##server_compact_restore",
ImVec2(server_window_width_, server_window_height_))) {
if (server_window_) {
SDL_SetWindowShape(server_window_, nullptr);
}
if (server_window_ && server_window_bounds_saved_ &&
server_window_width_before_compact_ > 0 &&
server_window_height_before_compact_ > 0) {
SDL_SetWindowSize(server_window_, server_window_width_before_compact_,
server_window_height_before_compact_);
SDL_SetWindowPosition(server_window_, server_window_x_before_compact_,
server_window_y_before_compact_);
ImGui::InvisibleButton("##server_collapsed_area",
ImVec2(server_window_width_, server_window_height_));
server_window_width_ = (float)server_window_width_before_compact_;
server_window_height_ = (float)server_window_height_before_compact_;
}
server_window_compact_ = false;
server_window_bounds_saved_ = false;
HandleWindowDragForLastItem(server_window_,
server_window_collapsed_dragging_,
server_window_collapsed_drag_start_mouse_x_,
server_window_collapsed_drag_start_mouse_y_,
server_window_collapsed_drag_start_win_x_,
server_window_collapsed_drag_start_win_y_,
/*reset_on_deactivate=*/false);
const bool request_restore =
ImGui::IsItemDeactivated() && !server_window_collapsed_dragging_;
if (ImGui::IsItemDeactivated()) {
server_window_collapsed_dragging_ = false;
}
// Draw a visible circular affordance.
const float w = server_window_width_;
const float h = server_window_height_;
const float radius = (w < h ? w : h) * 0.5f - 1.0f;
const ImVec2 center(w * 0.5f, h * 0.5f);
draw_list->AddCircleFilled(center, radius, IM_COL32(255, 255, 255, 220),
32);
draw_list->AddCircle(center, radius, IM_COL32(0, 0, 0, 255), 32, 2.0f);
// A simple "restore" hint.
draw_list->AddRect(
ImVec2(center.x - radius * 0.35f, center.y - radius * 0.35f),
ImVec2(center.x + radius * 0.35f, center.y + radius * 0.35f),
IM_COL32(0, 0, 0, 255), 2.0f, 0, 2.0f);
if (request_restore && server_window_) {
int w = 0;
int x = 0;
int y = 0;
int h = 0;
SDL_GetWindowSize(server_window_, &w, &h);
SDL_GetWindowPosition(server_window_, &x, &y);
const int normal_h = server_window_normal_height_;
SDL_SetWindowSize(server_window_, w, normal_h);
SDL_SetWindowPosition(server_window_, x, y);
server_window_collapsed_ = false;
}
ImGui::End();
return 0;
@@ -122,12 +107,23 @@ int Render::ServerWindow() {
ImDrawList* draw_list = ImGui::GetWindowDrawList();
ImGui::PushStyleColor(ImGuiCol_ChildBg, ImVec4(1.0f, 1.0f, 1.0f, 1.0f));
ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0, 0));
float server_title_bar_button_width = server_window_title_bar_height_;
float server_title_bar_button_height = server_window_title_bar_height_;
// Drag area: the title bar excluding the right-side buttons.
{
const float drag_w =
server_window_width_ - server_title_bar_button_width * 2;
const float drag_h = server_title_bar_button_height;
ImGui::SetCursorPos(ImVec2(0.0f, 0.0f));
ImGui::InvisibleButton("##server_title_drag_area", ImVec2(drag_w, drag_h));
HandleWindowDragForLastItem(
server_window_, server_window_dragging_,
server_window_drag_start_mouse_x_, server_window_drag_start_mouse_y_,
server_window_drag_start_win_x_, server_window_drag_start_win_y_);
}
float minimize_button_pos_x =
server_window_width_ - server_title_bar_button_width * 2;
ImGui::SetCursorPos(ImVec2(minimize_button_pos_x, 0.0f));
@@ -143,36 +139,18 @@ int Render::ServerWindow() {
ImVec2(server_title_bar_button_width,
server_title_bar_button_height))) {
if (server_window_) {
int w = 0, h = 0;
int x = 0, y = 0;
int w = 0;
int h = 0;
int x = 0;
int y = 0;
SDL_GetWindowSize(server_window_, &w, &h);
SDL_GetWindowPosition(server_window_, &x, &y);
server_window_width_before_compact_ = w;
server_window_height_before_compact_ = h;
server_window_x_before_compact_ = x;
server_window_y_before_compact_ = y;
server_window_bounds_saved_ = true;
constexpr int kCompactSize = 50;
SDL_SetWindowSize(server_window_, kCompactSize, kCompactSize);
// Move to bottom-right of the current display's usable bounds.
SDL_Rect display_bounds;
if (SDL_GetDisplayUsableBounds(SDL_GetDisplayForWindow(server_window_),
&display_bounds)) {
int compact_x = display_bounds.x + display_bounds.w - kCompactSize;
int compact_y = display_bounds.y + display_bounds.h - kCompactSize;
SDL_SetWindowPosition(server_window_, compact_x, compact_y);
}
// Use pixel size to match transparency buffer on HiDPI.
int w_px = kCompactSize;
int h_px = kCompactSize;
SDL_GetWindowSizeInPixels(server_window_, &w_px, &h_px);
const int diameter = (w_px < h_px ? w_px : h_px);
SetServerWindowCircleShape(server_window_, diameter);
server_window_compact_ = true;
const int collapsed_h = (int)server_window_title_bar_height_;
// Collapse upward: keep top edge stable.
SDL_SetWindowSize(server_window_, w, collapsed_h);
SDL_SetWindowPosition(server_window_, x, y);
server_window_collapsed_ = true;
}
}
draw_list->AddLine(
@@ -212,8 +190,6 @@ int Render::ServerWindow() {
IM_COL32(0, 0, 0, 255));
ImGui::PopStyleColor(3);
ImGui::PopStyleVar();
ImGui::PopStyleColor();
ImGui::EndChild();
ImGui::PopStyleVar();